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SPF with Alternate-port SMTP?

Last updated 1 min read Email Troubleshooting

Article Summary

  • If your domain uses Alternate-port SMTP, add the token 'include:no-ip.com' to your SPF string.
  • The include keeps your SPF record valid even if the IP address of smtp-auth.no-ip.com changes.
  • A ready-to-use example record is 'v=spf1 include:no-ip.com -all'.

If you are creating an SPF record for your domain that uses Alternate-port SMTP, simply add this token to your SPF string: include:no-ip.com. This way, if the IP address of smtp-auth.no-ip.com ever changes, your SPF record will remain valid.

An example SPF record (and one you can use) is: v=spf1 include:no-ip.com -all

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