On 02.04.13 00:39, Mark Constable wrote:
>I set up one small VPS as an alternate outgoing mail server for those
>times when our main mailservers gets blacklisted and do not want it to
>handle incoming mail or act as a 2nd MX. What config settings could I
>safely tweak to turn off port 25 and still allow outgoing mail to be
>delivered?
>
>25/tcp open smtp
>465/tcp open smtps
>587/tcp open submission
What do you mean by "outgoing" mail?
If your clients send mail through your mail server, then it's incoming mail
for that server, even if it's outgoing for your organization.
The allowed ports only depend on your clients' mail configuration, if they
only send mail using 587/submission, you don't need other ports open.
Outlook up to 2007 (and Outlook Express until 6 I think) can only use SSL
protocol which requires 465/ssl to be open (and this is the only/main reason
why this port is being used in the world).
I advise you deny port 25, unless you have clients that can't change ports.
However: you don't need to have extra server, you can change outgoing IP on
your mailserver by specifying SOURCE_ADDRESS= in ${ETC}/courier, if you get
into problems. This means nobody has to change configuration of its client.
Note that you MUST clear your problem and mail queue before you change your
IP, otherwise you will only get your new IP banned.
--
Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
Linux is like a teepee: no Windows, no Gates and an apache inside...
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