Re: [opensuse] SMTP (Port 25 and Black List)

os@xxxxxxxxxx wrote:

Yes I have my server hosted on a different ISP. It has multiple host =20
on it so changing the port is not an option. my Isp has blocked use of =20
googles submisson port to force everyone to either use webmail or pay =20
a fee to use their smtp server. Static IP is not an Option. I was =20
thinking about port forwarding through a ssh connection directly to my =20
server.

Apparently we misunderstood each other magnificently. How many hosts (or
better said domains) the server is hosting does not matter.

So your problem is, that you have a server which you want to use to send
mails. The server is already running and has a static ip. The only trouble
is that you can't connect to that server on port 25, because Sprint is
firewalling outgoing port 25.

In that case the solution is definitely to use Port 587 (submission) to
connect to your server. You only need to tell your server to open port 587
and only allow mail submission through that port, if the user authenticates.

With Postfix the following lines in master.cf would take care of that:

submission inet n - n - - smtpd
-o smtpd_sasl_auth_enable=yes
-o smtpd_recipient_restrictions=permit_sasl_authenticated,reject

This would force users to authenticate. Then you only have to change the
setting in your mailclient to connect to port 587. If you want to be
thorough, you could add TLS to the mandantory options.

I assume that you already have sasl set up to authenticate when you submit
mails to your server.

--
Sandy

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