On Tue, Aug 05, 2014 at 09:28:24PM +0000, Xie, Wei wrote:
> > What you're proposing is not viable, and seems to serve no purpose.
> > You should explain the problem you're trying to solve by adding
> > these, rather than the problems you're having doing so.
>
> When the message hits our outbound Postfix servers, on an MSA the "To:"
> address only list one recipient. We do not need consider multiple
> recipients.
This rather severely limits the usability of your MSA. It cannot
support ordinary email sent to multiple recipients or Bcc'ed. Also
you say this is an MSA, and yet claim the mail is sent by external
senders outside OSU. How are these two statements compatible? Is
this an MSA processing outbound mail generated internally at OSU,
or simply an outbound relay, forwarding mail whose recipients are
external to your email systems (possibly your users hosted outside).
Explain your system more clearly.
> The problem is the nexthop - Microsoft antispam system due to their bugs is
> eating some outbound emails from non-osu.edu or non-ohio-state.edu senders
> to forwarding accounts. But their system does not eat the emails which
> are "Resent-From" from mailbox users ("Resent-From:" is appropriate when
> a user takes a message delivered to his mailbox (possibly long after
> initial delivery) and resends it to another user (typically not an original
> recipient). Our exchange engineers ask whether Postfix can add "Resent-From:
> <original to address>" for emails to forwarding accounts like mailbox
> accounts resent the emails to bypass Microsoft antispam system (this is
> one of all kinds attempts).
Mail you've accepted (whether inbound or outbound) that is then
forwarded to Microsoft for a hosted mailbox SHOULD NOT be spam
filtered by Microsoft. That resposibility falls on your systems
as the original systems that receive the mail from the external
sender.
The systems you use to forward mail to Microsoft for your own hosted
users, MUST be whitelisted by Microsoft for delivery to the hosted
users in question, with NO spam filters applied by them.
If Microsoft cannot do this for you, find a better email hosting
provider. You're wasting time attacking the wrong problem.
--
Viktor.
