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Disable SMTPUTF8 in Postfix because Dovecot LMTP doesn't support it and bounces messages that require SMTPUTF8

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By not advertising SMTPUTF8 support at the start, senders may opt to transmit recipient internationalized domain names in IDNA form instead, which will be deliverable.

Incoming mail with internationalized domains was probably working prior to our move to Ubuntu 18.04 when postfix's SMTPUTF8 support became enabled by default.

The previous commit is retained because Mail-in-a-Box users might prefer to keep SMTPUTF8 on for outbound mail, if they are not using internationalized domains for email, in which case the previous commit fixes the 'relay access denied' error even if the emails aren't deliverable.
This commit is contained in:
Joshua Tauberer
2021-09-18 19:54:48 -04:00
parent 3e19f85fad
commit 113b7bd827
4 changed files with 10 additions and 3 deletions
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6
setup/mail-users.sh
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@@ -101,8 +101,12 @@ EOF
# ### Destination Validation
# Use a Sqlite3 database to check whether a destination email address exists,
# and to perform any email alias rewrites in Postfix.
# and to perform any email alias rewrites in Postfix. Additionally, we disable
# SMTPUTF8 because Dovecot's LMTP server that delivers mail to inboxes does
# not support it, and if a message is received with the SMTPUTF8 flag it will
# bounce.
tools/editconf.py /etc/postfix/main.cf \
smtputf8_enable=no \
virtual_mailbox_domains=sqlite:/etc/postfix/virtual-mailbox-domains.cf \
virtual_mailbox_maps=sqlite:/etc/postfix/virtual-mailbox-maps.cf \
virtual_alias_maps=sqlite:/etc/postfix/virtual-alias-maps.cf \