Heres a head scratcher.. my email server seems to have been working right for a while now.. suddenly one of my clients seems to have troubles sending emails to a particular address.
Heres what it looks like in the log file:
Mar 7 21:22:42 www postfix/smtp: connect to symaptico.ca[220.127.116.11]: Connection refused (port 25)
Mar 7 21:22:42 www postfix/smtp: C1B09FDE6: to=<firstname.lastname@example.org>, relay=none, delay=370212, status=deferred (connect to symaptico.ca 18.104.22.168]: Connection refused)
Keep in mind i have several domains hosted on my server.
My best guess is that sympatico.ca is configured to refuse the connection from my server to deliver mail to it as an anti spamming measure and that it may be due to my server being configured to host multiple virtual domains.
If this is the case what is the best way to configure my own server so connections to SMTP servers configured like sympatico.ca will not be refused in the future?