SPF with Alternate-port SMTP?

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 might be: v=spf1 include:no-ip.com -all

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