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opaque

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Hi,

I was wondering if the option to reject mail that has invalid SPF/Caller ID means it rejects mail that cannot be verified (including ones from domains without caller ID/SPF support), or does it just block messages that specifically say that that IP is not permitted to send emails from testdomain.com?

I don't want to block invalid Caller ID if it also blocks domains that dont support it. Thanks

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winkelman

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It will only reject mail from domains that do have CallerID setup, but the mail isn't originating from the listed domains mail server. Mails from domains without CallerID will be accepted. You're just not sure the mail actually is from who it says it is.

So setting up CallerID or SPF records for your own domain prevents others from sending mail 'in your name' (well, at least to servers that do the check).
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opaque

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What if our own mail server has no caller ID/SPF? I use register.com's DNS and they don't provide this functionality. Can I just set up my IP addresses as exempted? Thanks!

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sedell

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If you don't have a record published, you have nothing to worry about. The lookup will not succeed, and SPF/Caller-ID check will not be done.

register.com doesn't let you publish TXT records? That's all that's needed to set up SPF and Caller-ID.

Scott
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opaque

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Oh, I see.

Nope, not that I can see. It's always been A, C Name, MX. Personally I hate their new interface. Their old one was much easier to use.

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