On 2018-09-20 9:26 p.m., James Knott wrote:
On 09/20/2018 09:18 PM, Carlos E. R. wrote:
I have issues with Bell
So do I, but for other reasons. I refuse to do business with them, though I sometimes have to deal with them through work.
Regardless, according to RFC 8314, the standard is to use port 465 & SSL/TLS. Port 25 was never intended to be used by email clients.
Well, yes it was, back in 1982; see RFC821 and /etc/services but that was "simple" and 'unauthenticated' and "insecure" and hence it was hacked and abused, so we don't use that any more. We use TLS instead. Postfix is quite flexible in how you define the routing and transport. In http://www.postfix.org/transport.5.html we find <quote> In the case of delivery via SMTP, one may specify hostname:service instead of just a host: example.com smtp:bar.example:2025 This directs mail for user@example.com to host bar.example port 2025. Instead of a numerical port a symbolic name may be used </quote> That last refers to /etc/services
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