Author Topic: Zentyal firewall question Port 25  (Read 1696 times)

zimbodel

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Zentyal firewall question Port 25
« on: February 09, 2012, 05:56:01 pm »
Comcast silently blocked port 25 and caused an enormous amount of damage to my business as we had no clue why our mailservers stopped working.
They should be sued and really inform customers if they silently block ports.

anyway.

Could anyone tell me how to configure the zentyal firewall to redirect all smtp connections destined for port 25 to e.g. port 587.
Meaning: redirect all outgoing mail configured by postfix or sendmail to be connecting to remote mailserver:25 to mailserver:587
I know it is easy and the firewall config is really veryu nicely done, but I still find the redirects confusing.

Thanks

stuartiannaylor

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Re: Zentyal firewall question Port 25
« Reply #1 on: February 10, 2012, 12:54:48 am »
I am not exactly sure about this but you need port 25. Or use a smart host to relay your mail.

Do a google for smart host relay. A lot of the dynadns, zonedit people do.

If I am wrong I am sure someone will mention it :)

robb

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Re: Zentyal firewall question Port 25
« Reply #2 on: February 10, 2012, 01:23:11 pm »
As Stuart mentioned, use a smarthost if your provider blocks port25. A lot of ISP's do that and they have their own managed smarthost to do the relaying for you.
Probably comcast has info on how to configure your mailserver to use their SMTP to send mail.