external/mailinabox
1
0
Fork 0
mirror of https://github.com/mail-in-a-box/mailinabox.git synced 2026-03-05 15:57:23 +01:00
Code Issues Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

4
management/mailconfig.py
View File

@@ -16,8 +16,8 @@ import idna
def validate_email(email, mode=None):
# Checks that an email address is syntactically valid. Returns True/False.
# Until Postfix supports SMTPUTF8, an email address may contain ASCII
# characters only; IDNs must be IDNA-encoded.
# An email address may contain ASCII characters only because Dovecot's
# authentication mechanism gets confused with other character encodings.
#
# When mode=="user", we're checking that this can be a user account name.
# Dovecot has tighter restrictions - letters, numbers, underscore, and