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Change Postfix's smtp_address_preference to ipv4

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downtownallday 2025-02-23 06:53:22 -05:00
parent 362d5c5c4c
commit 4373b0ba75
1 changed files with 13 additions and 0 deletions
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13
setup/mail-postfix.sh
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@ -71,6 +71,19 @@ tools/editconf.py /etc/postfix/main.cf \
smtpd_banner="\$myhostname ESMTP Hi, I'm a Mail-in-a-Box (Ubuntu/Postfix; see https://mailinabox.email/)" \
mydestination=localhost
# Spamhaus blacklists IPv6 addresses at the /64 granularity, so if an
# ISP is assigning addresses to customers at a lower granularity and
# Spamhaus finds just 1 other machine behaving badly in that range,
# the entire range is (unfairly) blacklisted.
#
# Configure Postfix to use IPv4 before IPv6 for outbound mail delivery
# when MX records containing both addresses have equal
# preference. This can help deliver mail in the above scenario because
# Spamhaus has no such range restriction for IPv4.
tools/editconf.py /etc/postfix/main.cf \
smtp_address_preference=ipv4
# Tweak some queue settings:
# * Inform users when their e-mail delivery is delayed more than 3 hours (default is not to warn).
# * Stop trying to send an undeliverable e-mail after 2 days (instead of 5), and for bounce messages just try for 1 day.