diff --git a/EnvelopeGenerator.Application/Contracts/IEnvelopeReceiverService.cs b/EnvelopeGenerator.Application/Contracts/IEnvelopeReceiverService.cs
index 75a897a2..0004238e 100644
--- a/EnvelopeGenerator.Application/Contracts/IEnvelopeReceiverService.cs
+++ b/EnvelopeGenerator.Application/Contracts/IEnvelopeReceiverService.cs
@@ -1,7 +1,7 @@
 using DigitalData.Core.Abstractions.Application;
 using DigitalData.Core.DTO;
 using EnvelopeGenerator.Application.DTOs.EnvelopeReceiver;
-using EnvelopeGenerator.Application.DTOs.Receiver;
+using EnvelopeGenerator.Application.DTOs.Messaging;
 using EnvelopeGenerator.Domain.Entities;
 
 namespace EnvelopeGenerator.Application.Contracts
@@ -30,5 +30,7 @@ namespace EnvelopeGenerator.Application.Contracts
         Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadByUsernameAsync(string username, int? min_status = null, int? max_status = null, params int[] ignore_statuses);
 
         Task<DataResult<string?>> ReadLastUsedReceiverNameByMail(string mail);
+
+        Task<DataResult<SmsResponse>> SendSmsAsync(string envelopeReceiverId, string message);
     }
 }
\ No newline at end of file
diff --git a/EnvelopeGenerator.Application/Key.cs b/EnvelopeGenerator.Application/Key.cs
index 4509d0ea..52f35d19 100644
--- a/EnvelopeGenerator.Application/Key.cs
+++ b/EnvelopeGenerator.Application/Key.cs
@@ -14,6 +14,7 @@
         public static readonly string PossibleSecurityBreach = nameof(PossibleSecurityBreach);
         public static readonly string WrongEnvelopeReceiverId = nameof(WrongEnvelopeReceiverId);
         public static readonly string EnvelopeOrReceiverNonexists = nameof(EnvelopeOrReceiverNonexists);
+        public static readonly string PhoneNumberNonexists = nameof(PhoneNumberNonexists);
         public static readonly string Default = nameof(Default);
     }
 }
\ No newline at end of file
diff --git a/EnvelopeGenerator.Application/Services/EnvelopeReceiverService.cs b/EnvelopeGenerator.Application/Services/EnvelopeReceiverService.cs
index 12b5ea11..0ab6eb7c 100644
--- a/EnvelopeGenerator.Application/Services/EnvelopeReceiverService.cs
+++ b/EnvelopeGenerator.Application/Services/EnvelopeReceiverService.cs
@@ -9,6 +9,7 @@ using EnvelopeGenerator.Infrastructure.Contracts;
 using Microsoft.Extensions.Localization;
 using Microsoft.Extensions.Logging;
 using EnvelopeGenerator.Extensions;
+using EnvelopeGenerator.Application.DTOs.Messaging;
 
 namespace EnvelopeGenerator.Application.Services
 {
@@ -16,10 +17,13 @@ namespace EnvelopeGenerator.Application.Services
     {
         private readonly IStringLocalizer<Resource> _localizer;
 
-        public EnvelopeReceiverService(IEnvelopeReceiverRepository repository, IStringLocalizer<Resource> localizer, IMapper mapper)
+        private readonly IMessagingService _messagingService;
+
+        public EnvelopeReceiverService(IEnvelopeReceiverRepository repository, IStringLocalizer<Resource> localizer, IMapper mapper, IMessagingService messagingService)
             : base(repository, mapper)
         {
             _localizer = localizer;
+            _messagingService = messagingService;
         }
 
         public async Task<DataResult<IEnumerable<EnvelopeReceiverDto>>> ReadBySignatureAsync(string signature, bool withEnvelope = false, bool withReceiver = true)
@@ -135,5 +139,31 @@ namespace EnvelopeGenerator.Application.Services
             var er = await _repository.ReadLastByReceiver(mail);
             return er is null ? Result.Fail<string?>().Notice(LogLevel.None, Flag.NotFound) : Result.Success(er.Name);
         }
+
+        public async Task<DataResult<SmsResponse>> SendSmsAsync(string envelopeReceiverId, string message)
+        {
+            (string? uuid, string? signature) = envelopeReceiverId.DecodeEnvelopeReceiverId();
+
+            if (uuid is null || signature is null)
+                return Result.Fail<SmsResponse>()
+                    .Message(_localizer[Key.WrongEnvelopeReceiverId])
+                    .Notice(LogLevel.Warning, (uuid, signature).ToTitle())
+                    .Notice(LogLevel.Warning, EnvelopeFlag.WrongEnvelopeReceiverId)
+                    .Notice(LogLevel.Warning, Flag.PossibleSecurityBreach);
+
+            var env_rcv = await _repository.ReadByUuidSignatureAsync(uuid: uuid, signature: signature, withEnvelope: false, withReceiver: false);
+            if (env_rcv is null)
+                return Result.Fail<SmsResponse>()
+                    .Message(Key.EnvelopeReceiverNotFound);
+
+            if (env_rcv.PhoneNumber is null)
+                return Result.Fail<SmsResponse>()
+                    .Message(Key.PhoneNumberNonexists)
+                    .Notice(LogLevel.Error, Flag.NotFound, $"An attempt was made to send sms to the user whose phone number is null. Envelope recipient ID is {envelopeReceiverId}, UUID is {uuid} and signature is {signature}.");
+
+            var res = await _messagingService.SendSmsAsync(recipient: env_rcv.PhoneNumber, message: message);
+
+            return Result.Success(res);
+        }
     }
 }
\ No newline at end of file