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A List of known ISPs that block port 25.
Posted by Support on 20 December 2007 03:37 AM
AT&T
BellSouth
CableOne
Charter
Comcast
ATTBI
Cox
EarthLink
Flashnet
MediaOne
MindSpring
MSN
NetZero
PeopePC
SpryNet
Sympatico.ca
Verio
Verizon

If your ISP is on this list please refer to the related KB article: Port 25 Blocking
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