Re: Swiss ISPs Required to Log and Store Email for Six Months

Thomas Shaddack wrote:

SMTP servers, if they have to receive mails, HAVE to listen on port 25. There is no way in the standard how to tell that SMTP on whateverserver.com listens in port 1234 instead.

Incidentally, this is not true for SRV records. In some ways, SRV is like MX, but it does a lot more. One of the new features is that you can specify a port. Unfortunately SRV is not widely used as yet. This may have positive implications for privacy, and negative implications for firewalls that do egress filtering. -- Pete