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Resolving Email Sending Problems

Email sending problems are usually caused by one of two things:

  • Before sending email using your own domain name as the SMTP server, you need to first login to a POP email box on your domain.  When you login to check your email, the server records your IP address and grants your IP address access to the SMTP server.  This security measure prevents unauthorized users from using your domain to relay email.  Note that every time you disconnect from the Internet, or if more than 24 hours have gone by, you will need to login to a POP email account again before sending more email.
  • If you are still unable to send email after checking a POP email account first, the problem is likely your ISP.  Many ISP's have now blocked port 25 which is required to access third party mail servers.  One of the following solutions should resolve this issue:
  • Contact your ISP and ask them for their SMTP server host name that you can use to send through.  This information may also be posted on your ISP's web site.  In most cases, switching to using your ISP's SMTP server will not prevent you from sending email from email addresses on your domain.


  • If your ISP is one of the few that have both blocked port 25 and also does not allow you to use their SMTP server for sending email from your own domain, we have implimented an additional solution. If your email software allows you to switch the SMTP outgoing server port (most do), switch the port your software uses from port 25 to port 2525.  This will bypass the block your provider has placed on port 25. (See also: Changing the Outgoing Mail Server Port in Outlook.)
  • One other issue that come up occassionally is being blocked by your own firewall. Usually it comes in the form of a "personal firewall" installed on your computer, but sometimes the firewall may be set up on your network router. Try disabling all firewalls to see if that fixes the problem. If it does, then read the documentation that came with your firewall to find out how to unblock port 25 (or 2525 if you're using the alternate sending port as described above).
Last updated January 19, 2011
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