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ISPs Blocking Port 25 (SMTP)

Many providers are now blocking port 25 (SMTP/Outgoing Mail Gateway) access from their clients to all servers other than the ISPs mail servers.

This means that hosting clients which have ISP service from these providers will not be able to use the SMTP service provided with the hosting accounts (this includes all hosting providers) and must use the mail server of their ISP or change the port 25 to port 587.

Known ISPs who block remote Port 25/SMTP Access
Outgoing Mail Server
AltaVista Free Access
AT&T WorldNet
Microsoft's MSN
Prodigy Internet
Verizon/GTE (Dial-Up)

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