Issue with "on behalf of" with outlook

"Allan P. Magmanlac" <[email protected]>
Newsgroups gmane.mail.majordomo.general
Message-ID <[email protected]>
Hello,
    I've been using majordomo-1.94.5 and lately users of mircosoft
outlook are asking why
the "on behalf of" appears on the message of the "From:" line. Any idea
what's causing this and
how to disable it.

Thanks.
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