this postfix log [upl-image-preview url=https://community.mailcow.email/assets/files/2024-05-28/1716896853-225772-image.png]

@"esackbauer"#p16072 but I modified the postfix to accept just IPV4 [upl-image-preview url=https://community.mailcow.email/assets/files/2024-05-28/1716898987-41038-image.png] and thanks for your help

I have problem when i want to send mail to Gmail

B-elorchi

this postfix log

esackbauer

Your IPv6 stack is not properly configured. Or firewall does not allow IPv6 port 25 outgoing

B-elorchi

esackbauer

but I modified the postfix to accept just IPV4

and thanks for your help

esackbauer

That is not enough:
https://docs.mailcow.email/post_installation/firststeps-disable_ipv6/

Maybe point 3 is enough, disable IPv6 in unbound.

[unknown] but I modified the postfix to accept just IPV4

Sending mails is outgoing, not incoming…