Falko i change the /etc/postfix/main.cf and in the option relayhost, i set this:
relayhost = mail.cablered.net.mx
where mail.clablered.net.mx is mi ISP provider, now some emails from my domain to gmail arrived OK, but sometimes others don't and receive this email:
The following message to <firstname.lastname@example.org> was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 550-"5.7.1 [188.8.131.52] The IP you're using to
send mail is not authorized to\n5.7.1 send email directly to our servers. Please use
the SMTP relay at your\n5.7.1 service provider instead. Learn more at
i did not change my DNS, and i change the relayhost line because im desperate and i don't know what more i can do!!
i attach my main.cf file as txt.
My ISP said me they set de reverse DNS:
do i have to do something with this? do i have to create a dns in ISPConfig? what kind of dns? how?
Thaknk for your patience