The situation is not solved yet, but I want to express a big thanks to everyone
who replied.
I’m waiting for a reply from my ISP about the port 25 interference.
I’ve leaned a lot from your suggestions, although some are at the edge of my
capabilities.
Setting up a new VPS is actually what I wa
My ISP might be filtering port 25, I have no idea.
BUT, I’m NOT connecting to my ISP as the mail log show.
I connect directly to the recipients SMTP and get the right reply.
That’s why I find suspicious that I get a bounce where the ISP is mentioned.
Unless they, considering this is Thailand, is i
I recently moved my my VPS to a home server, Ubuntu 20.04.
I have a fixed IP, and host 3 domains.
Setup the “usual” postfix/dovecot/mysql e.t.c.
This is the 4’th time I’ve done this setup after a server move, but the first
time I’ve run into anything like this.
DNS is setup with all the necessary
