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SMTP Internet provider interception - I do not like it.
Tuesday - Aug 16th 2011 - by - (0 comments)

As I already wrote in a post in May 2010, Switzerland's biggest Internet Provider (Swisscom) doesn't allow to use port 25 to send e-mail anymore (except when using Swisscom's SMTP servers).

The interception can be seen with a simple telnet to the web server of my website (area-1.ch):

telnet area-1.ch 25
220 zhhdzmsp-nwas18.bluewin.ch ESMTP Service (Swisscom Schweiz AG) ready
helo this-isnt-right.ch
250 zhhdzmsp-nwas18 says HELO to

Instead of area-1.ch, the response comes from zhhdzmsp-nwas18.bluewin.ch. Clearly an interception (or port forwarding on the provider site).

For all independent web hosters this is such a pain, and even more for their customers as they must manually switch the SMTP port in their mail clients.


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