Hello,
I noticed in our delivery logs, that some mails (looks like system messages) are discarded because it triggers "Remote server does not support SMTPUTF8".
This is correct because I disabled SMTPUTF8 support on our outgoing gateway, because since SmarterMail started to support SMTPUTF8 we had a lot of delivery trouble (but this is another topic).
However, I don't understand why SmarterMail requires SMTPUTF8 to relay these messages to our gateway.
I don't see any chars here in these enveloppe addresses that would require the use of SMTPUTF8 ?
I also noticed this happens when the From or To contains a tilda char (~) which also doesn't seems to require SMTPUTF8.
Any clue on what could be wrong ?
Unfortunately as they are system messages, I'm not aware of a way to capture the corresponding hdr or eml file as it is removed from spool right away after it fails.
Example delivery log:
[2024.10.25] 07:16:43.001 [55807286] Delivery started for EMPTY (via bypass) at 07:16:43
[2024.10.25] 07:16:43.001 [55807286] Spool message was missing Return-Path; Also missing FROM header. If this is a system message this is normal behavior.
[2024.10.25] 07:16:46.016 [55807286] Added to SpamCheckQueue (0 queued; 2/60 processing)
[2024.10.25] 07:16:46.016 [55807286] [SpamCheckQueue] Begin Processing.
[2024.10.25] 07:16:46.016 [55807286] Blocked Sender Checks started.
[2024.10.25] 07:16:46.017 [55807286] Blocked Sender Checks completed.
[2024.10.25] 07:16:46.017 [55807286] Spam Checks started.
[2024.10.25] 07:16:46.017 [55807286] Spam Checks skipped: User authenticated
[2024.10.25] 07:16:46.017 [55807286] Spam Checks completed.
[2024.10.25] 07:16:46.018 [55807286] Removed from SpamCheckQueue (0 queued or processing)
[2024.10.25] 07:16:49.022 [55807286] Added to LocalDeliveryQueue (1 queued; 1/150 processing)
[2024.10.25] 07:16:49.022 [55807286] [LocalDeliveryQueue] Begin Processing.
[2024.10.25] 07:16:49.024 [55807286] Starting local delivery to info@some-domain.com
[2024.10.25] 07:16:49.027 [55807286] Delivery for EMPTY to info@some-domain.com has completed (Forwarded Delivered) Filter: None
[2024.10.25] 07:16:49.027 [55807286] End delivery to info@some-domain.com (MessageID: <9d0f57f064964a3d85d7631735f29b5e@b3dd32786b75488ebc25ef0fe1fd5b6b>)
[2024.10.25] 07:16:49.027 [55807286] Removed from LocalDeliveryQueue (0 queued or processing)
[2024.10.25] 07:17:19.089 [55807286] Added to RemoteDeliveryQueue (1 queued; 1/100 processing)
[2024.10.25] 07:17:19.089 [55807286] [RemoteDeliveryQueue] Begin Processing.
[2024.10.25] 07:17:19.089 [55807286] Sending remote mail from
[2024.10.25] 07:17:19.091 [55807286] Spam check results: [_CUSTOMRULES: ]
[2024.10.25] 07:17:19.092 [55807286] ARecord count: '1' for domain 'mta-gw.swisscenter.net'
[2024.10.25] 07:17:19.092 [55807286] Attempting ARecord Host Name: 'mta-gw.swisscenter.net', preference '1', Ip Count: '1'
[2024.10.25] 07:17:19.092 [55807286] Attempting to send to ARecord 'mta-gw.swisscenter.net' ip: '94.103.96.149'
[2024.10.25] 07:17:19.092 [55807286] Sending remote mail to: some_user@hotmail.com
[2024.10.25] 07:17:19.092 [55807286] Initiating connection to 94.103.96.149
[2024.10.25] 07:17:19.092 [55807286] Connecting to 94.103.96.149:25 (Id: 1)
[2024.10.25] 07:17:19.092 [55807286] Binding to local IP 192.168.60.100 (Id: 1)
[2024.10.25] 07:17:19.093 [55807286] Connection to 94.103.96.149:25 from 192.168.60.100:57693 succeeded (Id: 1)
[2024.10.25] 07:17:19.129 [55807286] RSP: 220 mta-gw.swisscenter.net ESMTP Haraka/3.0.2 ready
[2024.10.25] 07:17:19.130 [55807286] CMD: EHLO mail01.swisscenter.com
[2024.10.25] 07:17:19.160 [55807286] RSP: 250-mta-gw.swisscenter.net Hello mail01.swisscenter.com [94.103.96.138]Haraka is at your service.
[2024.10.25] 07:17:19.160 [55807286] RSP: 250-PIPELINING
[2024.10.25] 07:17:19.160 [55807286] RSP: 250-8BITMIME
[2024.10.25] 07:17:19.160 [55807286] RSP: 250-SIZE 0
[2024.10.25] 07:17:19.160 [55807286] RSP: 250 STARTTLS
[2024.10.25] 07:17:19.161 [55807286] CMD: QUIT
[2024.10.25] 07:17:19.192 [55807286] RSP: 221 mta-gw.swisscenter.net closing connection. Have a jolly good day.
[2024.10.25] 07:17:19.192 [55807286] [NotOriginatingServer] Remote server does not support SMTPUTF8.
[2024.10.25] 07:17:19.192 [55807286] CMD: QUIT
[2024.10.25] 07:17:24.223 [55807286] Attempt to ip, '94.103.96.149' success: 'True'
[2024.10.25] 07:17:24.224 [55807286] Delivery for info@some-domain.com to some_domain@hotmail.com has completed (Bounced)
[2024.10.25] 07:17:24.224 [55807286] Removed from RemoteDeliveryQueue (1 queued or processing)
[2024.10.25] 07:17:25.105 [55807286] Removing Spool message: Killed: False, Failed: False, Finished: True
[2024.10.25] 07:17:25.105 [55807286] Delivery finished for at 07:17:25 [id:-1015055807286]
Kind regards.