diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderEditorPage.razor b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderEditorPage.razor
index c1cd9fca..8ec8991f 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderEditorPage.razor
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Components/Pages/EnvelopeSenderEditorPage.razor
@@ -1,13 +1,15 @@
-@page "/envelope/editor"
+@page "/sender/editor"
 @rendermode InteractiveServer
 @using DevExpress.Blazor.PdfViewer
 @using DevExpress.Blazor.Reporting.Models
 @using DevExpress.Blazor
 @using EnvelopeGenerator.Server.Client.Services
+@using EnvelopeGenerator.Server.Services
 @using Microsoft.AspNetCore.Components.Forms
 @inject IJSRuntime JSRuntime
 @inject AppVersionService AppVersion
 @inject ILogger<EnvelopeSenderEditorPage> Logger
+@inject EnvelopeReceiverPageDataService ReceiverPageDataService
 
 <link href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.min.css" rel="stylesheet" />
 <link href="@AppVersion.GetVersionedUrl("css/envelope-viewer.css")" rel="stylesheet" />
@@ -21,22 +23,66 @@
              style="flex-direction: row; align-items: center; padding: 0.35rem 1.5rem; gap: 0.75rem;">
 
             @* Left: Title *@
-            <div style="flex: 1; min-width: 0; display: flex; align-items: center; gap: 0.75rem;">
-                <div style="font-size: 0.9rem; font-weight: 600; color: #1f2937; white-space: nowrap;">
-                    Neues Dokument
-                </div>
-                @if (_pdfLoaded)
-                {
-                    <span style="font-size: 0.7rem; color: #6b7280;">@_fileName</span>
-                    @if (_signatureFields.Count > 0)
+            <div style="flex: 1; min-width: 0; display: flex; flex-direction: column; align-items: stretch; gap: 0.75rem;">
+                <div style="display: flex; align-items: center; gap: 0.75rem; min-width: 0; flex-wrap: wrap;">
+                    <div style="font-size: 0.9rem; font-weight: 600; color: #1f2937; white-space: nowrap;">
+                        Neues Dokument
+                    </div>
+                    @if (_pdfLoaded)
                     {
-                        <span style="display: inline-flex; align-items: center; padding: 0.125rem 0.4rem;
-                                     background: #ede9fe; border-radius: 0.25rem; color: #6d28d9;
-                                     font-weight: 500; font-size: 0.7rem; white-space: nowrap;">
-                            @_signatureFields.Count Signaturfeld@(_signatureFields.Count != 1 ? "er" : "")
-                        </span>
+                        <span style="font-size: 0.7rem; color: #6b7280;">@_fileName</span>
+                        @if (_signatureFields.Count > 0)
+                        {
+                            <span style="display: inline-flex; align-items: center; padding: 0.125rem 0.4rem;
+                                         background: #ede9fe; border-radius: 0.25rem; color: #6d28d9;
+                                         font-weight: 500; font-size: 0.7rem; white-space: nowrap;">
+                                @_signatureFields.Count Signaturfeld@(_signatureFields.Count != 1 ? "er" : "")
+                            </span>
+                        }
                     }
-                }
+                </div>
+
+                <div class="sender-receivers-panel">
+                    <div class="sender-receivers-panel__header">
+                        <div class="sender-receivers-panel__title-wrap">
+                            <span class="sender-receivers-panel__title">Empfänger</span>
+                            <span class="sender-receivers-panel__count">@_receivers.Count</span>
+                        </div>
+
+                        <DxButton CssClass="sender-receivers-panel__add-btn pdf-toolbar-like-btn pdf-toolbar-like-btn--add"
+                                  Text="Empfänger hinzufügen"
+                                  RenderStyle="ButtonRenderStyle.Secondary"
+                                  SizeMode="SizeMode.Small"
+                                  Click="OpenAddReceiverPopup" />
+                    </div>
+
+                    @if (_receivers.Count == 0)
+                    {
+                        <div class="sender-receivers-panel__empty">
+                            Noch keine Empfänger hinzugefügt.
+                        </div>
+                    }
+                    else
+                    {
+                        <div class="sender-receivers-list">
+                            @foreach (var receiver in _receivers)
+                            {
+                                <div class="sender-receiver-chip">
+                                    <div class="sender-receiver-chip__body">
+                                        <div class="sender-receiver-chip__name">@receiver.FullName</div>
+                                        <div class="sender-receiver-chip__email">@receiver.Email</div>
+                                    </div>
+
+                                    <DxButton CssClass="sender-receiver-chip__action pdf-toolbar-like-btn pdf-toolbar-like-btn--signature"
+                                              Text="Signatur hinzufügen"
+                                              RenderStyle="ButtonRenderStyle.Secondary"
+                                              SizeMode="SizeMode.Small"
+                                              Click="@(() => AddSignatureForReceiver(receiver))" />
+                                </div>
+                            }
+                        </div>
+                    }
+                </div>
             </div>
 
             @* Right: Buttons *@
@@ -208,6 +254,78 @@
     </div>
 </div>
 
+<DxPopup @bind-Visible="_receiverPopupVisible"
+         HeaderText="Empfänger hinzufügen"
+         ShowFooter="true"
+         CloseOnEscape="true"
+         Width="720px"
+         CssClass="sender-receiver-popup">
+    <BodyContentTemplate Context="popupContext">
+        <div class="sender-receiver-popup__body">
+            <div class="sender-receiver-popup__form-grid">
+                <div class="sender-receiver-popup__field">
+                    <div class="sender-receiver-popup__label">Vor- und Nachname</div>
+                    <DxTextBox Text="@_receiverDraftName"
+                               TextChanged="OnReceiverNameChanged"
+                               NullText="Max Mustermann"
+                               ClearButtonDisplayMode="DataEditorClearButtonDisplayMode.Auto"
+                               BindValueMode="BindValueMode.OnInput"
+                               CssClass="w-100" />
+                </div>
+
+                <div class="sender-receiver-popup__field">
+                    <div class="sender-receiver-popup__label">E-Mail-Adresse</div>
+                    <DxTextBox Text="@_receiverDraftEmail"
+                               TextChanged="OnReceiverEmailTextChangedAsync"
+                               NullText="name@beispiel.de"
+                               ClearButtonDisplayMode="DataEditorClearButtonDisplayMode.Auto"
+                               BindValueMode="BindValueMode.OnInput"
+                               CssClass="w-100" />
+
+                    <div class="sender-receiver-popup__suggestions-shell">
+                        @if (_receiverEmailSuggestions.Count > 0)
+                        {
+                            <div class="sender-receiver-popup__suggestions">
+                            <DxListBox TData="string"
+                                       TValue="string"
+                                       Data="@_receiverEmailSuggestions"
+                                       Value="@_receiverDraftEmail"
+                                       ValueChanged="OnReceiverEmailSuggestionSelectedAsync"
+                                       SelectionMode="ListBoxSelectionMode.Single"
+                                       CssClass="w-100" />
+                            </div>
+                        }
+                    </div>
+                </div>
+            </div>
+
+            <div class="sender-receiver-popup__hint">
+                Bereits verwendete E-Mail-Adressen werden bei der Eingabe vorgeschlagen.
+            </div>
+
+            @if (_isReceiverEmailSearchRunning)
+            {
+                <div class="sender-receiver-popup__loading">E-Mail-Vorschläge werden geladen…</div>
+            }
+
+            @if (!string.IsNullOrWhiteSpace(_receiverPopupValidationMessage))
+            {
+                <div class="sender-receiver-popup__validation">@_receiverPopupValidationMessage</div>
+            }
+        </div>
+    </BodyContentTemplate>
+    <FooterContentTemplate>
+        <div class="sender-receiver-popup__footer">
+            <DxButton Text="Abbrechen"
+                      RenderStyle="ButtonRenderStyle.Secondary"
+                      Click="CloseAddReceiverPopup" />
+            <DxButton Text="Empfänger hinzufügen"
+                      RenderStyle="ButtonRenderStyle.Primary"
+                      Click="SaveReceiverAsync" />
+        </div>
+    </FooterContentTemplate>
+</DxPopup>
+
 @code {
     // ── Constants ──
     // Signature field size in PDF points (fixed): 1.77" × 1.96" × 72 pt/inch
@@ -227,6 +345,15 @@
     string? _errorMessage;
     bool _placementMode = false;
     List<SignatureFieldDraft> _signatureFields = [];
+    List<ReceiverDraft> _receivers = [];
+    bool _receiverPopupVisible;
+    string _receiverDraftName = string.Empty;
+    string _receiverDraftEmail = string.Empty;
+    string? _receiverPopupValidationMessage;
+    bool _isReceiverEmailSearchRunning;
+    List<string> _receiverEmailSuggestions = [];
+    int _receiverEmailSearchVersion;
+    static readonly System.ComponentModel.DataAnnotations.EmailAddressAttribute ReceiverEmailValidator = new();
 
     // ── PDF upload ──
     async Task OnPdfFileSelectedAsync(InputFileChangeEventArgs e)
@@ -336,6 +463,120 @@
             $"[SenderEditor] Total fields: {_signatureFields.Count}");
     }
 
+    void OpenAddReceiverPopup()
+    {
+        _receiverDraftName = string.Empty;
+        _receiverDraftEmail = string.Empty;
+        _receiverPopupValidationMessage = null;
+        _receiverEmailSuggestions.Clear();
+        _receiverPopupVisible = true;
+    }
+
+    void CloseAddReceiverPopup()
+    {
+        _receiverPopupVisible = false;
+        _receiverPopupValidationMessage = null;
+        _isReceiverEmailSearchRunning = false;
+    }
+
+    void OnReceiverNameChanged(string? value)
+    {
+        _receiverDraftName = value ?? string.Empty;
+        _receiverPopupValidationMessage = null;
+    }
+
+    Task OnReceiverEmailSuggestionSelectedAsync(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+            return Task.CompletedTask;
+
+        _receiverDraftEmail = value.Trim();
+        _receiverPopupValidationMessage = null;
+        return Task.CompletedTask;
+    }
+
+    async Task OnReceiverEmailTextChangedAsync(string? value)
+    {
+        _receiverDraftEmail = value?.Trim() ?? string.Empty;
+        _receiverPopupValidationMessage = null;
+
+        var searchVersion = ++_receiverEmailSearchVersion;
+
+        if (string.IsNullOrWhiteSpace(_receiverDraftEmail) || _receiverDraftEmail.Length < 2)
+        {
+            _receiverEmailSuggestions.Clear();
+            _isReceiverEmailSearchRunning = false;
+            return;
+        }
+
+        _isReceiverEmailSearchRunning = true;
+
+        try
+        {
+            var results = await ReceiverPageDataService.SearchReceiverEMailsAsync(_receiverDraftEmail);
+
+          if (searchVersion != _receiverEmailSearchVersion)
+                return;
+
+            _receiverEmailSuggestions = results
+                .Where(email => !string.IsNullOrWhiteSpace(email))
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .OrderBy(email => email)
+                .Take(12)
+                .ToList();
+        }
+        catch (Exception ex)
+        {
+            Logger.LogWarning(ex, "Failed to load receiver email suggestions for {SearchTerm}", _receiverDraftEmail);
+            if (searchVersion == _receiverEmailSearchVersion)
+                _receiverEmailSuggestions.Clear();
+        }
+        finally
+        {
+            if (searchVersion == _receiverEmailSearchVersion)
+                _isReceiverEmailSearchRunning = false;
+        }
+    }
+
+    Task SaveReceiverAsync()
+    {
+        var fullName = _receiverDraftName.Trim();
+        var email = _receiverDraftEmail.Trim();
+
+        if (string.IsNullOrWhiteSpace(fullName))
+        {
+            _receiverPopupValidationMessage = "Bitte geben Sie einen Vor- und Nachnamen ein.";
+            return Task.CompletedTask;
+        }
+
+        if (string.IsNullOrWhiteSpace(email))
+        {
+            _receiverPopupValidationMessage = "Bitte geben Sie eine E-Mail-Adresse ein.";
+            return Task.CompletedTask;
+        }
+
+        if (!ReceiverEmailValidator.IsValid(email))
+        {
+            _receiverPopupValidationMessage = "Bitte geben Sie eine gültige E-Mail-Adresse ein.";
+            return Task.CompletedTask;
+        }
+
+        if (_receivers.Any(receiver => string.Equals(receiver.Email, email, StringComparison.OrdinalIgnoreCase)))
+        {
+            _receiverPopupValidationMessage = "Diese E-Mail-Adresse wurde bereits hinzugefügt.";
+            return Task.CompletedTask;
+        }
+
+        _receivers.Add(new ReceiverDraft(Guid.NewGuid(), fullName, email));
+        CloseAddReceiverPopup();
+        return Task.CompletedTask;
+    }
+
+    void AddSignatureForReceiver(ReceiverDraft receiver)
+    {
+        Logger.LogInformation("Signature placement requested for receiver {Email}", receiver.Email);
+    }
+
     protected override async Task OnAfterRenderAsync(bool firstRender)
     {
         if (!_pdfLoaded || _errorMessage is not null)
@@ -351,4 +592,6 @@
     record SignatureFieldDraft(double XPt, double YPt, int Page, double DisplayX, double DisplayY);
 
     record OverlayCoords(double RelX, double RelY, double ContainerW, double ContainerH);
+
+    record ReceiverDraft(Guid Id, string FullName, string Email);
 }
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Services/EnvelopeReceiverPageDataService.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Services/EnvelopeReceiverPageDataService.cs
index 563db72e..a367a54e 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Services/EnvelopeReceiverPageDataService.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Services/EnvelopeReceiverPageDataService.cs
@@ -4,12 +4,14 @@ using EnvelopeGenerator.Application.Common.Dto;
 using EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver;
 using EnvelopeGenerator.Application.Documents.Queries;
 using EnvelopeGenerator.Application.EnvelopeReceivers.Queries;
+using EnvelopeGenerator.Application.Receivers.Queries;
 using EnvelopeGenerator.Server.Client.Models;
 using EnvelopeGenerator.Server.Client.Models.Constants;
 using EnvelopeGenerator.Server.Extensions;
 using EnvelopeGenerator.Server.Options;
 using MediatR;
 using Microsoft.Extensions.Caching.Distributed;
+using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Options;
 using ApplicationEnvelopeReceiverDto = EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver.EnvelopeReceiverDto;
 
@@ -21,7 +23,8 @@ namespace EnvelopeGenerator.Server.Services;
 public class EnvelopeReceiverPageDataService(
     IMediator mediator,
     IDistributedCache cache,
-    IOptions<CacheOptions> cacheOptions)
+    IOptions<CacheOptions> cacheOptions,
+    IMemoryCache memoryCache)
 {
     private const string SignatureCacheKeyPrefix = "envelope-generator.receiver-ui.signature:";
 
@@ -101,4 +104,23 @@ public class EnvelopeReceiverPageDataService(
         Page = element.Page,
         SenderAppType = (EnvelopeGenerator.Server.Client.Models.Constants.SenderAppType)element.SenderAppType
     };
+
+    private static readonly string ReceiverEmailSearchCacheKey = Guid.NewGuid().ToString();
+
+    public async Task<IEnumerable<string>> SearchReceiverEMailsAsync(string emailSearchTerm, CancellationToken cancellationToken = default)
+    {
+
+        return await memoryCache.GetOrCreateAsync(ReceiverEmailSearchCacheKey + emailSearchTerm, async entry =>
+        {
+            var query = new ReadReceiverQuery { EmailAddressSearch = emailSearchTerm };
+            var receivers = await mediator.Send(query, cancellationToken);
+
+            if(receivers.Any())
+                entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(30);
+            else
+                entry.AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(10);
+
+            return receivers.Select(r => r.EmailAddress);
+        }) ?? [];
+    }
 }
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/envelope-viewer.css b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/envelope-viewer.css
index da42b7f9..fa214406 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/envelope-viewer.css
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/wwwroot/css/envelope-viewer.css
@@ -573,6 +573,273 @@ body.resizing {
     white-space: nowrap;
 }
 
+.sender-receivers-panel {
+    display: flex;
+    flex-direction: column;
+    gap: 0.625rem;
+    padding: 0.75rem 0.9rem;
+    border-radius: 12px;
+    background: linear-gradient(135deg, rgba(126, 34, 206, 0.05) 0%, rgba(42, 82, 152, 0.05) 100%);
+    border: 1px solid rgba(126, 34, 206, 0.12);
+}
+
+.sender-receivers-panel__header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 0.75rem;
+    flex-wrap: wrap;
+}
+
+.sender-receivers-panel__title-wrap {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.5rem;
+}
+
+.sender-receivers-panel__title {
+    font-size: 0.8rem;
+    font-weight: 700;
+    color: #4c1d95;
+    letter-spacing: 0.02em;
+}
+
+.sender-receivers-panel__count {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    min-width: 1.5rem;
+    min-height: 1.5rem;
+    padding: 0 0.45rem;
+    border-radius: 999px;
+    background: rgba(79, 70, 229, 0.12);
+    color: #5b21b6;
+    font-size: 0.72rem;
+    font-weight: 700;
+}
+
+.sender-receivers-panel__add-btn .dxbl-btn {
+    border-radius: 8px;
+    font-weight: 600;
+}
+
+.pdf-toolbar-like-btn .dxbl-btn {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    gap: 0.4rem;
+    min-height: 34px;
+    padding: 0.45rem 0.85rem;
+    border-radius: 8px;
+    border: 1px solid rgba(126, 34, 206, 0.2);
+    background: linear-gradient(135deg, rgba(126, 34, 206, 0.05) 0%, rgba(42, 82, 152, 0.05) 100%);
+    color: #1e293b;
+    font-size: 0.75rem;
+    font-weight: 600;
+    box-shadow: none;
+    transition: all 0.2s ease;
+}
+
+.pdf-toolbar-like-btn .dxbl-btn:hover:not(:disabled) {
+    background: linear-gradient(135deg, rgba(126, 34, 206, 0.1) 0%, rgba(42, 82, 152, 0.1) 100%);
+    border-color: rgba(126, 34, 206, 0.4);
+    color: #1e293b;
+    transform: translateY(-1px);
+    box-shadow: 0 4px 12px rgba(126, 34, 206, 0.2);
+}
+
+.pdf-toolbar-like-btn .dxbl-btn:active:not(:disabled) {
+    transform: translateY(0);
+    box-shadow: 0 2px 6px rgba(126, 34, 206, 0.15);
+}
+
+.pdf-toolbar-like-btn--add .dxbl-btn::before,
+.pdf-toolbar-like-btn--signature .dxbl-btn::before {
+    display: inline-block;
+    font-size: 0.9rem;
+    line-height: 1;
+    font-weight: 700;
+}
+
+.pdf-toolbar-like-btn--add .dxbl-btn::before {
+    content: '+';
+    color: #7e22ce;
+}
+
+.pdf-toolbar-like-btn--signature .dxbl-btn {
+    color: #7e22ce;
+}
+
+.pdf-toolbar-like-btn--signature .dxbl-btn::before {
+    content: '?';
+    color: #7e22ce;
+}
+
+.pdf-toolbar-like-btn--signature .dxbl-btn:hover:not(:disabled) {
+    color: #7e22ce;
+}
+
+.sender-receivers-panel__empty {
+    font-size: 0.78rem;
+    color: #64748b;
+}
+
+.sender-receivers-list {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 0.625rem;
+}
+
+.sender-receiver-chip {
+    display: inline-flex;
+    align-items: center;
+    gap: 0.75rem;
+    min-width: 220px;
+    max-width: 100%;
+    padding: 0.625rem 0.75rem;
+    border-radius: 12px;
+    background: rgba(255, 255, 255, 0.88);
+    border: 1px solid rgba(126, 34, 206, 0.12);
+    box-shadow: 0 6px 16px rgba(15, 23, 42, 0.06);
+}
+
+.sender-receiver-chip__body {
+    min-width: 0;
+    flex: 1;
+}
+
+.sender-receiver-chip__name {
+    font-size: 0.78rem;
+    font-weight: 700;
+    color: #1f2937;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.sender-receiver-chip__email {
+    margin-top: 0.15rem;
+    font-size: 0.72rem;
+    color: #64748b;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.sender-receiver-chip__action .dxbl-btn {
+    border-radius: 8px;
+    font-weight: 600;
+    white-space: nowrap;
+}
+
+.sender-receiver-popup .dxbl-modal {
+    border-radius: 18px;
+}
+
+.sender-receiver-popup .dxbl-popup {
+    max-width: min(720px, calc(100vw - 2rem));
+}
+
+.sender-receiver-popup .dxbl-popup-content {
+    padding: 1rem 1.25rem 1.1rem;
+}
+
+.sender-receiver-popup .dxbl-popup-header {
+    padding: 0.95rem 1.25rem;
+}
+
+.sender-receiver-popup .dxbl-popup-footer {
+    padding: 0.75rem 1.25rem 1rem;
+}
+
+.sender-receiver-popup__body {
+    display: flex;
+    flex-direction: column;
+    gap: 0.9rem;
+}
+
+.sender-receiver-popup__form-grid {
+    display: grid;
+    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+    gap: 1rem 1.25rem;
+    align-items: start;
+    min-height: 250px;
+}
+
+.sender-receiver-popup__field {
+    min-width: 0;
+}
+
+.sender-receiver-popup__label {
+    margin-bottom: 0.45rem;
+    font-size: 0.82rem;
+    font-weight: 600;
+    color: #475569;
+}
+
+.sender-receiver-popup__field .dxbl-text-edit,
+.sender-receiver-popup__field .dxbl-dropdown-edit {
+    width: 100%;
+}
+
+.sender-receiver-popup__field .dxbl-input-editor,
+.sender-receiver-popup__field .dxbl-text-edit-input {
+    min-height: 38px;
+}
+
+.sender-receiver-popup__suggestions-shell {
+    min-height: 188px;
+    margin-top: 0.5rem;
+}
+
+.sender-receiver-popup__suggestions {
+    border: 1px solid rgba(126, 34, 206, 0.12);
+    border-radius: 10px;
+    background: rgba(255, 255, 255, 0.98);
+    overflow: hidden;
+}
+
+.sender-receiver-popup__suggestions .dxbl-listbox {
+    border: none;
+}
+
+.sender-receiver-popup__suggestions .dxbl-listbox-scroll-viewer {
+    max-height: 180px;
+}
+
+.sender-receiver-popup__hint {
+    font-size: 0.78rem;
+    color: #64748b;
+}
+
+.sender-receiver-popup__loading {
+    font-size: 0.78rem;
+    color: #4f46e5;
+    font-weight: 600;
+}
+
+.sender-receiver-popup__validation {
+    padding: 0.625rem 0.75rem;
+    border-radius: 10px;
+    background: rgba(239, 68, 68, 0.08);
+    color: #b91c1c;
+    font-size: 0.8rem;
+    font-weight: 600;
+}
+
+.sender-receiver-popup__footer {
+    display: flex;
+    justify-content: flex-end;
+    gap: 0.5rem;
+    width: 100%;
+}
+
+.sender-receiver-popup__footer .dxbl-btn {
+    min-width: 148px;
+    border-radius: 8px;
+    font-weight: 600;
+}
+
 .pdf-frame {
     background: white;
     border-radius: 16px;
@@ -775,6 +1042,30 @@ body.resizing {
         flex-wrap: wrap;
     }
 
+    .sender-receivers-panel {
+        padding: 0.625rem 0.75rem;
+    }
+
+    .sender-receiver-chip {
+        width: 100%;
+        min-width: 0;
+        flex-wrap: wrap;
+    }
+
+    .sender-receiver-chip__action {
+        width: 100%;
+    }
+
+    .sender-receiver-chip__action .dxbl-btn {
+        width: 100%;
+    }
+
+    .sender-receiver-popup__form-grid {
+        grid-template-columns: 1fr;
+        gap: 0.85rem;
+        min-height: 0;
+    }
+
     .envelope-title {
         font-size: 1rem;
     }