Greg Helledy on 26 Aug 2009 10:06:23 -0700

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[PLUG] Verizon blocking port 25

Verizon will soon be blocking outgoing connections on port 25 for 
dynamic IP customers.  This is presented as an anti-spam measure.  Their 
instructions are to change the port in your SMTP client software to port 
587 (which they presumably redirect to 25 before passing the packets on?)

Obviously this is a PITA for our laptop-using employees because they 
need to use port 587 when on the Verizon network and 25 elsewhere.  What 
exactly is Verizon achieving by doing this that they could not do on 
port 25?  Hope that no virus writers are clever enough to code to try 
multiple known SMTP ports?


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