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Recipient present in Body but not in RCPT to list

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Recipient present in Body but not in RCPT to list - 9.Jan.2015 5:06:34 AM   
YoyoLuke

 

Posts: 1
Joined: 9.Jan.2015
Status: offline
Hi all :)

New to the forums, but I have a query that I am hoping someone might be able to help with.

I was wondering, in what possible situations, would a sender's server not include a recipient in the RCPT To field when sending an email.

The scenario is thus - a 3rd party is sending an email to 2 domains, both domains have the same MX records, both domains reside on the same server.

When the sender sends an email - using outlook - they put both recipients in the TO field, one recipient is on domainA.com, the other is on domainB.com. However only domainA.com ever receives the email.

When checking the logs for the mail, we can see that although both domainA.com and domainB.com are present in the body, the SMTP session only shows one recipient was specified (example below):

SMTP LOGS

2015-01-07 17:57:50.134111500 11749196: 250-STARTTLS
2015-01-07 17:57:50.134111500 11749196: 250-PIPELINING
2015-01-07 17:57:50.134112500 11749196: 250 8BITMIME
2015-01-07 17:57:50.147954500 11749196: > STARTTLS
2015-01-07 17:57:50.160871500 11749196: < 220 ready for TLS
2015-01-07 17:57:50.259394500 11749196: > EHLO outbound.mailserver.com
2015-01-07 17:57:50.259395500 11749196: < 250-receivingserver.com
2015-01-07 17:57:50.259396500 11749196: 250-PIPELINING
2015-01-07 17:57:50.259396500 11749196: 250 8BITMIME
2015-01-07 17:57:50.273182500 11749196: > MAIL FROM:<chris@3rdpartysender.co.uk>
2015-01-07 17:57:50.274744500 11749196: < 250 OK
2015-01-07 17:57:50.288686500 11749196: > RCPT TO:<joebloggs@domainA.com>
2015-01-07 17:57:50.304623500 11749196: < 250 OK
2015-01-07 17:57:50.319077500 11749196: > DATA
2015-01-07 17:57:50.319264500 11749196: < 354 go ahead


BODY of email:

2015-01-07 17:57:50.454938500 29330088: Env From: {chris@3rdpartsender.co.uk}
2015-01-07 17:57:50.455915500 29330088: Env To: {joebloggs@domainA.com}
2015-01-07 17:57:50.456205500 29330088: Bdy From: {chris@3rdpartsender.co.uk}
2015-01-07 17:57:50.456248500 29330088: Bdy To: {joebloggs@domainA.com}
2015-01-07 17:57:50.456342500 29330088: Bdy To: {neil@domainB.com}


(I have modified the sender and recipients to mask the true senders in this set of logs.


As far as the sender is concerned, they have both recipients listed in the 2 field in their mail client when they send the mail. So I am at a loss as to why when their mail server transmits the mail, it only specifies the one recipient?

Does anyone have any real-world examples of why this would occur? I wasn't sure if - for example - if the sender has maybe domainB.com aliased to domainA.com in their address book maybe? This is just a complete guess of course. As far as I know the client is using Microsoft Outlook and doesn't have any additional scanning software, etc, their side.

If anyone can offer any insight, it would be greatly appreciated.

<Many thanks

Luke
Post #: 1

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