Koozali.org: home of the SME Server

Legacy Forums => Experienced User Forum => Topic started by: schotie on August 28, 2002, 08:47:34 PM

Title: damm isp...blocking port 25
Post by: schotie on August 28, 2002, 08:47:34 PM

hello to all!

I was upto now with an internet provider who didnt block anyports. Because of me moving house my new ISP blocks port 25....

Apart from me complainig like mad (didnt seem to help...) how is it possible that I can still use my home email server?

I use dynamic dns services but well I dont really want to pay for having this port redirected. with my being "scrougy" does this mean that I cant use mail anymore...I correct myself...does this mean that I can now only use webmail???
webmail doesnt use port 25 right??


thanks guys


Schotie....

Read the manual, search the forums, search google.com and if that prevails write in the forum :-)

Title: Re: damm isp...blocking port 25
Post by: Nathan Fowler on August 29, 2002, 12:56:45 AM

Without SMTP 25 being open you cannot receive incoming mail addressed to the domain hosted on the E-Smith box, you will have to either get a new ISP or pay for port redirection services...

This is assuming the MX record points to the E-Smith box.

Title: Re: damm isp...blocking port 25
Post by: Harro Bruins on September 03, 2002, 01:55:58 AM

It's also possible that your ISP offers a backdoor for using SMTP ports.

Let me explain...

ZoneEdit has my domain, in that I configured the 1st MX record to myself and the 2nd to my ISP's mail-detour, this is done to prevent black-list risks. The mail goes to me, there is no port 25 found on my server (BLOCKED) and it starts working on the 2nd MX record; Finds my ISP's server and pushes it there. That server has the weird feeling it shouldn't receive this and starts checking the DNS and discovers my settings. It is an internal network for my ISP so they DO see my port 25 and it tries to loose asap the mail to my addy. Works pretty well after having a lot of discussions how to make it work. Now they even publish that it's impossible to have your own mailserver... yeah right... fool the rest, not me...

BUT...

I'm not aware of what options you have to forward ports to other sections from your DNS. I know that QMail has a backdoor function on port 825. How to handle this exactly without using the default system is somthing I never researched, but for my needs (AVMailGate) it was the solution.

Good luck...

Harro