Outgoing Mail | Solution21, Inc.
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Why should I call my ISP for outgoing mail?
If you are having problem sending out email from a mail client such as Outlook, Outlook Express or Thunderbird when attempting to check email at home or at the office, it is possible that your ISP is blocking the outbound SMTP port (Port 25).
Many ISP’s are blocking what is called “Port 25” which is the port used to send e-mail. All e-mail sent via the Internet is routed through Port 25, the channel used for communication between an e-mail client and an e-mail server.
The ISP’s are doing this to cut down on the amount of spam that is sent from their networks. Although Port 25 blocking has become an industry standard, some ISP’s still keep it open or filter it over time. The ISP’s that block Port 25 require their SMTP server to be used instead of the remote SMTP server.
While we highly recommend using your ISP for your outgoing server, you have the ability to get around this block temporarily by specifying a secondary port in your e-mail client. For example, you can set Outlook/Outlook Express to use Port 587 for SMTP. It will then use Port 587 to send your e-mail messages to the server.