RE: Mail Rejected when we relay for a client.

11 msg	SMTP authentication with saslauthd against PAM
7 msg	Error in SMTP sequence
2 msg	dkim-milter on relay server unknown-jobid exter...
11 msg	Stubborn Cert issue
3 msg	Problems with false positives
4 msg	reject_unverified_recipient case sensitive?
3 msg	dkim=fail (verification error: invalid key gran...
5 msg	? Using header checks on (Postini) X-pstn-levels
2 msg	Can't find error in my config file. Can you?
1 msg	chroot postgresql ssl problem
15 msg	What cert to buy
3 msg	Address re-writing

Mail Rejected when we relay for a client.
\ Joey (11 Apr 2007)
. \ Noel Jones (11 Apr 2007)
. \ Sandy Drobic (11 Apr 2007)
. . \ Jesper Lund (11 Apr 2007)
. . \ Noel Jones (11 Apr 2007)
. . . \ Sandy Drobic (11 Apr 2007)
. . . . \ Joey (14 Apr 2007)
. . . . . \ Sandy Drobic (14 Apr 2007)
. . . . . \ Noel Jones (14 Apr 2007)

8 msg	Queueing up archive messages
2 msg	Cannot send e-mails from any e-mail clients
1 msg	Re: outbound mail failure - need to fix asap -S...
4 msg	outbound mail failure - need to fix asap
3 msg	Postfix alias problem
2 msg	problem to send a mail to a command in aliases
3 msg	smtpd_auth

Subject:	RE: Mail Rejected when we relay for a client.
Group:	Postfix-users
From:	Noel Jones
Date:	14 Apr 2007

At 07:02 PM 4/13/2007, Joey wrote:
>Thanks for all your responses, and sorry for my delay in responding.
>We got nailed with a lot of clients having the windows update that
>basically trashed peoples computers.
>
>I just want to clairify what is happening here, because maybe I
>painted the wrong picture.
>
>First I don't use reject_unverified_recipient anywhere in my configuration.

Postfix thinks you do. The log entry you supplied is clearly from
reject_unverified_recipient.

your choices:
a) get a list of valid recipients from the client.
b) tell the client they must permit your probes.
c) change address_verify_sender to something else.
d) skip recipient validation for this client (a poor choice)

>The problem I have is that I allow one of my client's servers to
>relay through our server for outgoing mail.
>Their ISP is always getting class C's blacklisted, so we simply
>allow our clients server to use us as relay.
>
>When we sent messages to that domain it rejects it from us, because
>they think we are the sender, which of course we are not.
>This must be the envelope sender -vs- the real sender.
>
>Apr 11 11:37:55 saturn postfix/smtpd[6174]: NOQUEUE: reject: RCPT from
>dsl-17-41.cofs.net[68.142.17.41]: 450 <sarah.belle>:
>Recipient address rejected: undeliverable address: host
>mail.anetwork.com[207.47.99.8]
>said: 550 5.2.1 Mailbox unavailable. This server does not accept
>mails from this sender address (postmaster). (in
>reply to RCPT TO command); from=<Joe>
>to=<sarah.belle> proto=ESMTP helo=<mail.impress123.com>
>
>Now for me to have a better understanding, whenever I allow anyone
>within my network to RELAY through our server, are we in
>effect re-labeling per say the real senders address?

No. The log entry is from an address probe.

--
Noel Jones