From: Tim B (mostlyharmlessoptonline.net)
Date: Tue Dec 02 2003 - 07:24:42 CST

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All,

I know Postfix is correct in this, and that To: Undisclosed-Recipients:;
  is 100% correct in accordance with RFC's. But my customer is refusing
to admit their sidewinder firewall is the cause of the problem, and
insist that Undisclosed-Recipients:; should be translated to
Undisclosed-Recipientstheirdomain.tld! I've shown them the RFC's, I've
talked to them, but they just don't want to admit the problem.

So what I want to try doing is tell Postfix to remove To:
Undisclosed-Recipients:; header (ie do not add To:
Undisclosed-Recipients:;)

I've put this in my header_checks_pcre
/^To: Undisclosed-Recipients:.*/ IGNORE
/^To: undisclosed-recipients:.*/ IGNORE

but it still seems that Postfix is putting right back in the To:
Undisclosed-REcipients:; header when it goes to deliver the mail to it's
final recipient via SMTP because I still see the rejection's in my log.

Dec 2 08:07:01 relay postfix/smtp[30304]: EB952A2674:
to=<XXXXXXXXXXX.XXX>, relay=mail.server.com [xxx.xxx.xxx.xxx], delay=2,
status=bounced (host mail.server.com[xxx.xxx.xxx.xxx] said: 553 5.0.0
undisclosed-recipients:;is an unqualified address)

is there anything else I can try to remove the To:
Undisclosed-Recipients:; ?

This is Postfix 1.1.13 on Mandrake Linux

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