If this has been discussed at length before, I apologize, my searches so
far come up empty...
Two nearby colleges, one of them the Univ. of Missouri, have been using SPF
to reject spam. That would generally good. We have been publishing SPF
records for a long time.
Here is the bad: they seem to be automatically rejecting messages outright
"soft fail".
We chose "soft fail" on purpose. While nearly all customers use our mail
servers (directly or via SMTP auth), we have many thousands of legacy
customers, for a variety of reasons, who are not on our IP ranges that send
using our domain. We published the SPF records as a helpful hint, not as an
outright indicator of rejection.
That is the whole point of "soft fail" isn't it?
Anyway, we are strongly considering withdrawing our SPF record to help our
customers send legitimate mail. I'd hate to do that.
Have any of you encountered this kind of behavior? Any suggestions?
John
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