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| author | Guilhem Moulin <guilhem@fripost.org> | 2018-12-06 19:22:10 +0100 |
|---|---|---|
| committer | Guilhem Moulin <guilhem@fripost.org> | 2018-12-06 19:22:10 +0100 |
| commit | a88db53786768309e9f88840231e5812506535bf (patch) | |
| tree | 6fea96ad6b5e22ecf65c5f123ea351e5d3cdd07d /roles/webmail/templates/etc/nginx | |
| parent | db38048fe11edb0464cb3ab45221660d9c329f04 (diff) | |
postfix ≥3.0: don't advertise SMTPUTF8 support.
We're relaying messages to our LMTP daemons (Dovecot, Amavisd) and some
downstream SMTP servers, not all of which are under our control.
Forwarding messages with UTF-8 envelope addresses or RFC 5322 headers
yields undeliverable messages, and the bounces make us a potential
backscatter source. So it's better to disable SMTPUTF8 at this point.
Cf. also http://www.postfix.org/SMTPUTF8_README.html and
https://unix.stackexchange.com/questions/320091/configure-postfix-and-dovecot-lmtp-to-receive-mail-via-smtputf8 .
See also upstream's comment at https://marc.info/?l=postfix-users&m=149183235529042&w=2 :
“Perhaps SMTPUTF8 autodetection could be more granular: UTF8 in the
envelope is definitely problematic for a receiver that does not
support SMTPUTF8, while UTF8 in a message header is less so.”
Diffstat (limited to 'roles/webmail/templates/etc/nginx')
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