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Re: sender address verification

From: Wietse Venema (wietseporcupine.org)
Date: Sat Sep 10 2005 - 16:06:44 CDT

suneel cumar:
> Hi All,
>
> I have enabled sender verification for 100 recipient.
> i could able to figure out that for some of the
> recipients the address are verifying but others which
> incoming same time doesn't checks for sender
> verification.
>
> By this i want to know the no of threads available for
> parallell sender verification. Is their any
> limitation
> on threads for sender verification.

http://www.postfix.org/ADDRESS_VERIFICATION_README.html#how

    How address verification works

    A sender or recipient address is verified by probing the nearest
    MTA for that address, without actually delivering mail. The
    nearest MTA could be Postfix itself, or it could be a remote
    MTA (SMTP interruptus). Probe messages are like normal mail,
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    except that they are never delivered, deferred or bounced;
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    probe messages are always discarded.
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

And he really means it.

        Wietse