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Re: RFC: Making mail-transport-agent Priority: optional



Hi there!

Disclaimer: I am not an SMTP expert.

On Sun, 16 Oct 2011 21:37:59 +0200, Josh Triplett wrote:
> Andrea Bolognani wrote:
>> The proxy one needs to go through to access the Internet from inside my
>> University buildings cuts off SMTP.
>
> Have you checked to see if it blocks SMTPS, or the submission port?
> The latter often gets through when port 25 won't, and SMTPS almost
> always works.

Andrea, if you need to ask, please do for the submission port [1][2]
with STARTTLS.  AFAIK there is no sense for SMTPS nowadays, and the fact
that port 465 has been assigned to something else [3] and that some MTA
do not support it are signs already in disfavor of SMTPS [4][5].

[1] <https://en.wikipedia.org/wiki/Mail_submission_agent>
[2] <http://www.ietf.org/rfc/rfc4409.txt>
[3] <https://en.wikipedia.org/wiki/SMTPS>
[4] <http://www.postfix.org/TLS_README.html#client_smtps>
[5] <http://www.debian-administration.org/articles/604>

Thx, bye,
Gismo / Luca

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