Unsecured wifi might be contributory negligence

Roland Perry lists at internetpolicyagency.com
Fri Feb 24 13:51:20 GMT 2012

In article <A4BCAED0-C855-46F8-8BA0-E206E1E95465 at batten.eu.org>, Ian 
Batten <igb at batten.eu.org> writes
>>> Wireless users can't contact my MTA, and would need to login to my
>>> ISP's.  No issues.
>> Many spammers will have their own MTA (it's faster than using someone
>>else's anyway), or back in the day use an open relay. I've got an MTA
>>on my Windows laptop (which is part of my road warrior kit).
>But a lot of ISPs block port 25 (and sometimes even 587) to and from
>anything other that their MTAs.  It's a common complaint for customers
>who want to (for whatever reason) use their own MTA.    I think that,
>aside from a few hold-outs, that's generally now held to be good practice.

Blocking (or transparent proxying) is very common for Port 25, but I've 
yet to encounter one that blocks Port 587 (not even the various Mobile 
Broadband offerings).

<Straw Poll> I'm posting this from a colleague's BT Broadband, using 
Port 587, to a non-BT MTA, no problems.
Roland Perry

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