Fritz Borgstedt wrote:
Questions and Answers for users of ASSP Anti-Spam SMTP Proxy
<[email protected]> schreibt:
**IF** you can do that, because you're 100% none of your users will
ever
send a mail from your domain from outside, do yourself a favour and
set a
dns spf record.


Most of us can do that.
All it takes is a user with a Blackberry to throw a wrench into all of that. BBs by default will send mail out via RIM's own SMTP servers. RIM refuses to publish SPF records for their servers too, making it impossible to regulate it via SPF.
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