The problem is with the sender domain. They can apparantly resolve your domain but not bizandus.com. Since I also can resolve it, it seems to me that the problem is with the columbia.com mailserver.
Dan Serhan Sevim wrote: > A customer of us brought a bouncing mail problem today while she was trying to send >an email to columbia.edu mail system. > She can not send any mail to any account in columbia.edu. Every mail is bouncing >back. However, I can send... I tried to send an email to [EMAIL PROTECTED] via >my our sendmail server. Message again bounced back saying "Sender domain must >resolve". Well, > Like I said, any email going from [EMAIL PROTECTED] (mine) gets thru and successfull. >Somehow, our customer whom uses the same email server as we do, can not.! > Any ideas? > Thank you! > > > Delivery failed 3 attempts: [EMAIL PROTECTED] > > > Original message follows. > > Received: from mtp362 [66.171.17.165] by mail.mezun.com with ESMTP > (SMTPD32-7.06) id ABE783B00E2; Tue, 08 Oct 2002 10:29:59 -0400 > From: "Melek Pulatkonak" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Subject: > Date: Tue, 8 Oct 2002 10:30:34 -0500 > Organization: Biz & US, Inc. > Message-ID: <000701c26edf$a5ba2f40$a511ab42@mtp362> > MIME-Version: 1.0 > Content-Type: multipart/alternative; > boundary="----=_NextPart_000_0008_01C26EB5.BCE42740" > X-Priority: 3 (Normal) > X-MSMail-Priority: Normal > X-Mailer: Microsoft Outlook, Build 10.0.2627 > Importance: Normal > X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4133.2400 > > This is a multi-part message in MIME format. > > ------=_NextPart_000_0008_01C26EB5.BCE42740 > Content-Type: text/plain; > charset="us-ascii" > Content-Transfer-Encoding: 7bit > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
