diff --git a/chatmaild/src/chatmaild/filtermail.py b/chatmaild/src/chatmaild/filtermail.py
index f8d755a9..6384c2e9 100644
--- a/chatmaild/src/chatmaild/filtermail.py
+++ b/chatmaild/src/chatmaild/filtermail.py
@@ -262,6 +262,7 @@ class OutgoingBeforeQueueHandler:
                     return
 
         passthrough_recipients = self.config.passthrough_recipients
+        passthrough_recipients.append("echo@" + self.config.mail_domain)
 
         for recipient in envelope.rcpt_tos:
             if recipient_matches_passthrough(recipient, passthrough_recipients):