How to disable IPv6 support in Postfix [Kaspersky Secure Mail Gateway]
By svc_kms in How-to
· 1157 views
Problem
Currently KSMG has IPv6 support enabled in Postfix:
inet_protocols = all
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However, Postfix 2.6 has a known limitation:
http://www.postfix.org/IPV6_README.html
"Postfix SMTP clients before version 2.8 try to connect over IPv6 before trying IPv4. With more recent Postfix versions, the order of IPv6 versus IPv4 outgoing connection attempts is configurable with the smtp_address_preference parameter. "
http://www.postfix.org/postconf.5.html#inet_protocols
"Postfix versions before 2.8 attempt to connect via IPv6 before attempting to use IPv4. "
Solution
Disable IPv6 to evade limitation by configuring:
KSMG1.1
inet_protocols = ipv4
in both
/opt/kaspersky/klms-appliance-addon/share/templates/main.cf.template
and
/etc/postfix/main.cf
and restarting Postfix afterwards:
systemctl restart postfix
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KSMG2.*/3.*
inet_protocols = ipv4
in
/opt/kaspersky/ksmg-appliance-addon/share/templates/main.cf.template
Then change any setting in Web-UI Settings - Build-In MTA - Basic settings. You can change value of Message size limit (bytes) by 1
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