Unable to send email; email software reports a socket error or unable to connect to SMTP server

If you are trying to send email and get socket errors from your email software, or if you see errors that say something like "cannot connect to smtp server," this is usually because you are using the default SMTP port 25 and your ISP is blocking connections to that port.  Fortunately the solution is very simple.

Simply go into the account settings for outgoing email inside your email software, and set your SMTP port to port 26 instead of port 25.

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