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I have setup postfix to use dovecot for authenticating smtp requests. This worked well until yesterday. Now my mail client says the server is offline and telnet for all standard ports yields: Connection Refused. I can send email from the webmail and can connect to the ports with telnet from within the server.

/var/log/mail.log says nothing about this refused connection.

Any ideas on how to get to the bottom of this problem?

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Seems my ISP has blocked the standard smtp port (25) and my postfix was only running on that port. Changed everything to smtps (port 465) and now it works.

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  • Don't use SMTPS; it has been deprecated for a decade now.
    – adaptr
    Jan 29, 2013 at 10:46
  • So what is the alternative? And does it change anything apart from the port number?
    – Nicholas
    Feb 1, 2013 at 21:16
  • Use STARTTLS with SASL instead, as amply documented in RFC4409.
    – adaptr
    Feb 4, 2013 at 8:27

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