Originally Posted by pattone
How do you setup your smtp relay?? you could take a look at http://www.howtoforge.com/postfix_re...her_mailserver
Do you know if your ISP don't block your port 25 (many ISPs does) you could try smtp submission to use port 587 instead, just edit master.cf of postfix configuration and uncomment th line that says
submission inet n - - - - smtpd
Or use SSL port 465. Just about every isp blocks port 25 unless you have a business account.