diff --git a/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/EmailSetCreatePerformer.scala b/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/EmailSetCreatePerformer.scala
index 84d5aeac749..0e5a8dcd90c 100644
--- a/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/EmailSetCreatePerformer.scala
+++ b/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/EmailSetCreatePerformer.scala
@@ -68,14 +68,16 @@ object EmailSetCreatePerformer {
     def asMessageSetError: SetError = e match {
       case e: MailboxNotFoundException => SetError.notFound(SetErrorDescription("Mailbox " + e.getMessage))
       case e: BlobNotFoundException => SetError.invalidArguments(SetErrorDescription(s"Attachment not found: ${e.blobId.value}"), Some(Properties("attachments")))
+      case e: SizeExceededException => SetError.tooLarge(SetErrorDescription(e.getMessage))
       case e: IllegalArgumentException => SetError.invalidArguments(SetErrorDescription(e.getMessage))
       case e: OverQuotaException => SetError.overQuota(SetErrorDescription(e.getMessage))
-      case e: TooLargeException => SetError.tooLarge(SetErrorDescription(e.getMessage))
       case _ => SetError.serverFail(SetErrorDescription(e.getMessage))
     }
   }
 }
 
+case class SizeExceededException(actualSize: Long, maximumSize: Long) extends IllegalArgumentException(s"Attempt to create a message of $actualSize bytes while the maximum allowed is $maximumSize")
+
 class EmailSetCreatePerformer @Inject()(serializer: EmailSetSerializer,
                                         blobResolvers: BlobResolvers,
                                         htmlTextExtractor: HtmlTextExtractor,
@@ -118,7 +120,7 @@ class EmailSetCreatePerformer @Inject()(serializer: EmailSetSerializer,
     }
   }
 
-  private def asAppendCommand(request: EmailCreationRequest, message: Message): Either[Exception, AppendCommand]  =
+  private def asAppendCommand(request: EmailCreationRequest, message: Message): Either[IllegalArgumentException, AppendCommand]  =
     Right(
       AppendCommand.builder()
         .recent()
@@ -128,6 +130,6 @@ class EmailSetCreatePerformer @Inject()(serializer: EmailSetSerializer,
       .flatMap(appendCommand =>
         configuration.getMaximumSendSize.toScala
           .filter(limit => appendCommand.getMsgIn.size() > limit)
-          .map(limit => Left(TooLargeException(appendCommand.getMsgIn.size(), limit)))
+          .map(limit => Left(SizeExceededException(appendCommand.getMsgIn.size(), limit)))
           .getOrElse(Right(appendCommand)))
 }
diff --git a/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/Method.scala b/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/Method.scala
index c54dee3251e..71f0ae3ef8b 100644
--- a/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/Method.scala
+++ b/server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/method/Method.scala
@@ -32,8 +32,6 @@ import reactor.core.scala.publisher.SFlux
 
 case class AccountNotFoundException(invocation: Invocation) extends IllegalArgumentException
 
-case class TooLargeException(actualSize: Long, maximumSize: Long) extends Exception(s"Attempt to create a message of $actualSize bytes while the maximum allowed is $maximumSize")
-
 case class InvocationWithContext(invocation: Invocation, processingContext: ProcessingContext) {
   def recordInvocation: InvocationWithContext = InvocationWithContext(invocation, processingContext.recordInvocation(invocation))
 }