[Mailman-Users] Few email ids being dropped

[BG Mahesh]

In the log file of mailman we see something like

to="user1 at xyz.com, user2 at xyz.com, user3 at xyz.com, user4 at xyz.com"

i.e. 4 users of the same domain are shown above. But on the mailserver of
xyz.com [which is sendmail] in maillog file we see only user1 at xyz.com, the
other 3 users are not in maillog of xyz.com and not receiving the email.

Where could it be getting lost?

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B.G. Mahesh