How do I set up SMTP on port 587

January 30, 2015 7k views
bartonphillips
By:
bartonphillips

I am using POSTFIX and Dovecot and have the incoming email working OK. Also outgoing via mail or sendmail works OK. But I can't seem to get Thunderbird on my home computer to connect with the server on port 587 (or 25 for that matter). I have tried telnet and also did an nmap which showed these ports open:
Discovered open port 80/tcp on 107.170.244.155
Discovered open port 143/tcp on 107.170.244.155
Discovered open port 8080/tcp on 107.170.244.155
Discovered open port 995/tcp on 107.170.244.155
Discovered open port 993/tcp on 107.170.244.155
Discovered open port 110/tcp on 107.170.244.155
Discovered open port 22/tcp on 107.170.244.155

Gut no 587 or 25. What am I missing?

Log In to Comment
1 Answer
ahrotahntee January 30, 2015

Since neither is open, I'm going to take a stab in the dark and say postfix isn't running.

service postfix start

Reply
  • bartonphillips January 30, 2015

    I had to edit /etc/postfix/master.cf and add
    submission inet n - - - - smtpd
    -o syslogname=postfix/submission
    -o smtpd    tlssecuritylevel=encrypt
    -o smtpdsaslauthenable=yes
    -o smtpd    relayrestrictions=permitsasl_authenticated,reject

    That opened port 587 but I am still having problems getting the send side in Thunderbird to work. Getting email to work all the way around is pretty complicated between postfix and dovecot.

Have another answer? Share your knowledge.