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Siebel Outbound Email Address Validation - Invalid "To" Addresses with Error: SMTP DATA error: 503 5.0.0 Need RCPT (recipient) and SBL-CMO-00152 (Doc ID 518574.1)

Last updated on JULY 20, 2021

Applies to:

Siebel eCommunications eMail Response - Version 7.7.2 SIA [18325] and later
Siebel Email Response - Version 7.7.2 [18325] and later
z*OBSOLETE: Microsoft Windows Server 2003
Product Release: V7 (Enterprise)
Version: 7.7.2 [18325]
Database: Microsoft SQL Server 2000 SP3
Application Server OS: Microsoft Windows 2003 Server
Database Server OS: Microsoft Windows 2003 Server

This document was previously published as Siebel SR 38-2505450751.


Users asked if Siebel does any validation on the "To" address of an outbound email.

On a test with a correct domain name, i.e., but wrong mailbox or localpart name: "lxxxx". The from address on these emails was a test email address:

The activity record status for this outbound email in Siebel was changed to "Done" after sending. But there were the following errors in the Comm Outbound Manager tasks screen:

"SMTP DATA error: 503 5.0.0 Need RCPT (recipient).
(commdlv.cpp (578)) SBL-CMO-00152: Send to, subject testing with email address had error ."

How did Siebel generate this error message? Did Siebel get some message from the SMTP server? I did not get any bounce back for this error email.

The same email was sent out from regular MS Outlook client , and got the following bounce back message:

"From: System Administrator
Sent: Monday, September 19, 2005 2:26 PM
Subject: Undeliverable:Testing from outlook

Your message did not reach some or all of the intended recipients.

      Subject:    Testing from outlook
      Sent:    9/19/2005 2:25 PM


 The following recipient(s) could not be reached: on 9/19/2005 2:26 PM
            The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
            < #5.1.1 smtp;550 5.1.1 <>... User unknown>"


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