Mailing List Archive

Excluding special recipients from SPF processing
I'm curious how SMTP receiver implementations of SPF are handling this
statement in the SPF draft, section 8.4 under "Conformance with regard to
receiving e-mail systems":

> Receiver systems SHOULD exclude special recipients such as
> postmaster@ and abuse@ from SPF processing. See RFC2142.

An SMTP receiver won't know the recipient's address until the RCPT command
is received. Does this mean that a SMTP server should accept the MAIL
command even when an SPF test results in "fail" - in case the recipient is
postmaster or abuse @ the local domain?

Daryl Odnert
Tumbleweed Communications
Redwood City, California

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Excluding special recipients from SPF processing [ In reply to ]
Daryl Odnert wrote:

> An SMTP receiver won't know the recipient's address until the RCPT command
> is received. Does this mean that a SMTP server should accept the MAIL
> command even when an SPF test results in "fail" - in case the recipient is
> postmaster or abuse @ the local domain?

Yes. And it should accept the mail also if the receiver has switched off the
spam filter.

ys Ramakanta dasa

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Re: Excluding special recipients from SPF processing [ In reply to ]
In <7382FCA44E27D411BD4A00508BD68F950AE31075@pigeon.tumbleweed.com> "Daryl Odnert" <daryl.odnert@tumbleweed.com> writes:

> An SMTP receiver won't know the recipient's address until the RCPT command
> is received. Does this mean that a SMTP server should accept the MAIL
> command even when an SPF test results in "fail" - in case the recipient is
> postmaster or abuse @ the local domain?


It is generally a good idea to wait until the RCPT TO anyway, since it
is usually very cheap to check whether the RCPT TO address is valid.


-wayne

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