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RE: [cobalt-users] MAIL/EXPN/VRFY/ETRN - Not localhost but all domains



> 
> Is the ISP using some kind of blocking to prevent customers 
> from sending via other SMTP?
> 
> Customers are connecting through various ISP's such as 
> Comcast, Cox and AOL.  That is why I think it is either 
> server related or a problem with my co-lo.  It seems to work 
> on an off and is not a constant problem.
> 

Cox blocks port 25 so their users must use Cox SMTP servers only, unless
you use port forwarding so they can use another port number.
-- 
C2003 Dan Kriwitsky

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