Hi, Code: # dovecot --version 2.3.13 (89f716dc2) # postconf mail_version mail_version = 3.5.13 Some mails are bounced with this message: Code: Aug 16 13:07:53 mail1 postfix/qmgr[511]: 23E1E58AFA: from=<[email protected]>, size=121780, nrcpt=1 (queue active) Aug 16 13:07:53 mail1 dovecot: lmtp(267535): Connect from local Aug 16 13:07:53 mail1 postfix/lmtp[267534]: 23E1E58AFA: to=<[email protected]>, relay=mail.yyy.com[private/dovecot-lmtp], delay=0.73, delays=0.72/0.01/0.01/0, dsn=5.6.7, status=bounced (SMTPUTF8 is required, but was not offered by host mail1.sitew3.com[private/dovecot-lmtp]) Aug 16 13:07:53 mail1 dovecot: lmtp(267535): Disconnect from local: Client has quit the connection (state=READY) Connecting to my mail server, it is advertising that it supports SMTPUTF8: Code: EHLO toto.com 250-mail1.sitew3.com 250-PIPELINING 250-SIZE 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH PLAIN LOGIN 250-AUTH=PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250-DSN 250-SMTPUTF8 250 CHUNKING however, dovecot doesn't seem to (didn't find newer info on this): https://dovecot.org/pipermail/dovecot/2019-May/115839.html The related params in postconf are: Code: compatibility_level = 2 smtputf8_autodetect_classes = sendmail, verify smtputf8_enable = ${{$compatibility_level} < {1} ? {no} : {yes}} If the problem is really dovecot, the only solution seems to prevent postfix to advertise SMTPUTF8, so what is the most sensitive way to do this: - set compatibility_level to 0 - or smtputf8_enable = no (this is what I have done for now, and it doesn't advertise SMTPUTF8 anymore) Or perhaps I missed some other thing? Thanks for any advice
If you are running ISPConfig on that e-mail server, do this to get context: https://forum.howtoforge.com/threads/please-read-before-posting.58408/ Have you modified the e-mail configurations outside ISPConfig?
No modifications about SMTPUTF8 for sure, so I guess this is the default configuration of ISPConfig. Thanks for confirmation. I indeed just received a mail that was previously bounced.
