Re: smtps 465 works, submission 587 does not

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On Thu, Dec 8, 2011 at 7:50 AM, Grant <emailgrant@xxxxxxxxx> wrote:
>>>> Squirrelmail runs on the same machine as postfix and sends mail fine
>>
>> Is there any reason you need an encrypted connection when sending mail
>> on the localhost?  This just creates unnecessary overhead and is
>> usually avoided if the connection is not over public networks.  It's
>> trivial to add a secondary listener to Postfix's master.cf that
>> accepts SquirrelMail/localhost-only email submissions unencrypted on
>> another port.
>
> Could you show me how to do that?

Add something such as this to master.cf, the port in this example
being 10025, which you'd need to change in the SquirrelMail config
too.

localhost:10025 inet  n       -       n       -       -      smtpd
  -o mynetworks=127.0.0.0/8
  -o content_filter=
  -o smtpd_client_restrictions=
  -o smtpd_helo_restrictions=
  -o smtpd_sender_restrictions=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject
  -o smtpd_data_restrictions=
  -o smtpd_end_of_data_restrictions=
  -o smtpd_restriction_classes=

There's a heap of other things you can add to this to tweak
performance as well, but this is OT here.

Using port 25 is OK, as long as you make sure no one else can use it
as an open relay, but moving your webmail traffic to another port like
this is better.  Also, be careful/conscious about settings such as "-o
content_filter=", since that could allow an attacker using a
compromised account to send spam and/or virus-laden emails from your
system.

-- 
Paul Lesniewski
SquirrelMail Team
Please support Open Source Software by donating to SquirrelMail!
http://squirrelmail.org/donate_paul_lesniewski.php

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