This is expected behavior. The *ENVELOPE* from is <>, while the From
header will be set to the recipient address (Postfix will not show this
in the logs). This can be overridden:
https://doc.dovecot.org/main/core/config/sieve/extensions/vacation.html#sieve_vacation_send_from_recipient
This protects against mail loops, so overriding this is not wise.
Regards,
Stephan.
Op 6-8-2025 om 10:03 schreef Ciprian M. Vizitiu [FDT] via dovecot:
Hello everyone,
Running a Dovecot 2.3.13 (Debian 11 native package) configured to deliver
to Postfix lmtp and using dovecot-sieve.
Setting-up a simple vacation responder works as expected but trying to
catch a missing header e.g.
if allof (not exists "X-GitLab-NotificationReason")
{
vacation :days 1 :addresses [1]"[email protected]" :subject "Message
sent to an automated address " :from [2]"[email protected]" text:
Hello,
This is an automated reply to let you know that
[3][email protected] is an automated address and is not read by a
human operator.
If you're trying to contact EXAMPLECOM please send your emails to
[4][email protected]
.
;
}
... will result in an empty "from:" field instead of the required
[5]"[email protected]" e.g.
Aug 06 09:41:45 email-001.example.com postfix/smtpd[1974551]: disconnect
from localhost[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Aug 06 09:41:45 email-001.example.com dovecot[1174421]:
lmtp([6][email protected])<1974562><uTh/ITkHk2giIR4AdMz+wA>:
sieve: msgid=[7]<[email protected]>:
vacation action: sent vacation response to
[8]<[email protected]>
Aug 06 09:41:45 email-001.example.com postfix/pickup[1956559]: B7BF8207C9:
uid=18018 from=<>
Aug 06 09:41:45 email-001.example.com postfix/cleanup[1974554]:
B7BF8207C9:
message-id=[9]<[email protected]>
Aug 06 09:41:45 email-001.example.com postfix/qmgr[1171599]: B7BF8207C9:
from=<>, size=979, nrcpt=2 (queue active)
Aug 06 09:41:45 email-001.example.com postfix/smtp[1974565]: B7BF8207C9:
to=[10]<[email protected]>,
relay=smtpconnector.upper.relay[192.168.2.14]:25, delay=0.12,
delays=0.06/0.01/0.03/0.02, dsn=5.7.1, status=bounced (host
smtpconnector.upper.relay[192.168.2.14] said: 554 5.7.1 <>: Sender address
rejected: Access denied (in reply to RCPT TO command))
I tried forcing
sieve_user_email = [11][email protected]
... but to no avail.
I'm well aware that I could try and fix the problem at Postfix level but
blindly catching ALL mails with an empty "from:" field feels bad: one
miss-configured daemon and we spam everyone plus we already do some
intricate rewriting.
Any ideas?
References
Visible links
1. mailto:[email protected]
2. mailto:[email protected]
3. mailto:[email protected]
4. mailto:[email protected]
5. mailto:[email protected]
6. mailto:[email protected]
7. mailto:[email protected]
8. mailto:[email protected]
9. mailto:[email protected]
10. mailto:[email protected]
11. mailto:[email protected]
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