On Sat, Feb 7, 2015 at 6:16 AM, Lindsay Haisley <fmouse-cour...@fmp.com>
wrote:
> What's the current status of port recommendations for courier for SSL
> and TLS (STARTTLS)? It may be my legacy configuration, but SSLPORT=465
> in esmtpd-ssl here. Online resources are confusing about this, the
> _official_ IANA document at
>
> http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.txt,
> updated 2015-02-05, lists port 465 as "URL Rendesvous Directory for SSM",
> service name "urd", but a lot of other documents refer to port 465 as
> "smtps". Google, for instance, uses standard TLS (SSH) encryption on port
> 465. The assignment of port 465 to smtps is labeled a "legacy" assignment
> in some documents, and in other places it's labeled as having been
> deprecated and the port reassigned.
Technically speaking, using port 465 for (authenticated) SMTP over SSL/TLS
has been deprecated for a long, long time.
Microsoft was long a lone holdout against standards, but recently, Apple
and Google have joined them, and if you're running a mail service for some
4-digit number of users or more, you'll likely either have to endure loads
of support calls debugging why port 25 and 587 doesn't work with STARTTLS
in some instances, or you'll cave in and enable TLS over port 465.
So, in practice, Apple and Google un-deprecated this use of port 465.
We may dislike it, but that's how it's turned out.
--
Jan
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