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I administer my own DNS here and have done it since Bind 4.9. I've read a number of articles on SPF records but I simply do not understand it. I see examples but the TXT line looks like jibberish to me. I guess the problem is I'm not understanding exactly how this SPF record or what is contained in the TXT line actually does anything to STOP spam and therefore I'm not following WHAT exactly my spf record should be from the example. Or, do I just take the example verbatium??
Suppose I have a mail server that answers at mail.myserver.com and there is an "A" record for mail.myserver.com. And there is an MX preference for mail.myserver.com.
What should be my spf record?
What else beside the MX and A record do I need besides the TXT spf record?
I would appreciate figuring this out because I want to clamp down on spam.