I am in the process of changing out mail server from Panther to Tiger (different servers). The DNS on both machines contain an SPF record (v=spf1 mx ptr -all) to prevent SPAM abuse. However, when I send a message from the new server they bounce with the receiving server issuing the following error:
554 5.7.1 SPF Fail: v=spf1 mx ptr -all (in reply to MAIL FROM command)
This does not happen when mail is sent from the current (Panther server). Why does this happen? Is it because my Tiger SMTP server is no yet on an MX record? If I add that server (I really don’t want mail going there quite yet) in a MX with a higher number will that correct the problem? TIA.
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