On Tue, Mar 26, 2013 at 1:20 PM, <kd6...@yahoo.com> wrote:
>
> You may not agree but that is what the function is for per the author.
> I agree that there are better ways (e.g. LDAP database) to do this than to
> fake an SMTP transaction, aborting just before the DATA phase. When I first
> saw this function years ago, I thought that its purpose was to make callbacks
> to the sender's mailbox to test reverse deliverability, not to exclusively
> test the primary MX's acceptability of the message from a secondary.
It's not necessarily between a primary and secondary with public MX's.
I found it very useful when the public MX's for a domain do not host
the actual users but instead relay through a private firewall to a
hidden internal delivery host. However the inbound spam rate
eventually made it impractical - and I started maintaining virtusers
tables with a default reject rule on the MX hosts that sendmail can
process very quickly.
--
Les Mikesell
lesmikes...@gmail.com
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