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Date:      Sat, 21 Aug 1999 11:43:34 +0930
From:      Greg Lehey <grog@lemis.com>
To:        "David B. Aas" <dave@ciminot.com>
Cc:        questions@FreeBSD.ORG
Subject:   Re: "Sender domain must exist" error
Message-ID:  <19990821114334.O14964@freebie.lemis.com>
In-Reply-To: <001f01beeb1c$ad953100$0fc8a8c0@dave.ciminot.com>; from David B. Aas on Fri, Aug 20, 1999 at 10:00:00AM -0500
References:  <001f01beeb1c$ad953100$0fc8a8c0@dave.ciminot.com>

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On Friday, 20 August 1999 at 10:00:00 -0500, David B. Aas wrote:
> I am getting an error message from POP3 clients when emial is sent. Email is
> received OK, but I cannont send.
>
> I am running Sendmail on FreeBSD 3.2. Sendmail is set up, and POP3 is
> enabled. My users have valid Unix usernames and passwords. My server name is
> gateway.townandcountry.org and my domain name is townandcountry.org.
>
> My users can connect and receive email. When email is sent, they get an
> error message on the POP3 client something like this:
>
> "The message could not be send because the server rejected the sender's
> email address. The sender's email address was ....Server Response "501
> gateway.townandcountry.org ... sender domain must exist"
>
> On the server console, an error message shows up "Sendmail ...
> ruleset=check_mail ...Reject=501 gateway.townandcountry.org sender domain
> must exist."
>
> I double-checked my sendmail.cf file. I have set up a D and a DM record. DNS
> is running and appears to be working OK.
>
> What am I missing? any help would be appreciated.

Reverse delegation?  Do you have PTR records for all your machines?

Greg
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