Thanks for that FAQ article with the domain names and IP addresses. That helped identify what needs to be in the SPF record. I host my own domains and email... have done so since around '95. I also do information security consulting, including proper DNS setup. Prior to this, only my inbound mail servers have been allowed to send email from my domain. Thus my SPF record was quite simple: v=spf1 mx -all This identifies that any MX record for the domain is allowed to send and nothing else. After reading that FAQ article, my SPF record is now: v=spf1 mx include:ccsend.com include:constantcontact.com include:confirmedcc.com -all I added in the ccsend.com domain since it was mentioned here. As noted above, you should not use the ~all as it negates the value of the SPF.
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