While is a bad idea to reject mail without SPF records, its a good idea to
reject email if the SPF record is present and incorrectly set or not
authorized for the sender (hardfail).
SA works after the email gets in the queue, but the most efficient way,
whenever possible, is to reject it (not bou
You were lucky you got a repsonse. I didn't and I was getting persistent
spam for years. Till I started looking deeper. The company behind was
internap. I think still it is. I went around and published the information I
had including the MTAs. It then stopped.
http://www.spamhaus.org/sbl/listings/
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