"On behalf of" From fields not correctly searched

X1 doesn’t properly search "on behalf of" From fields that Outlook displays as:

From: x@y.com on behalf of a@b.com

It searches "x@y.com" but not "a@b.com". This trips me up at least once a month, when I can't find a message I'm sure exists. This form of From field is pretty common:

- Messages sent by message boards on behalf of users

- Messages sent by executive admins on behalf of execs

- Messages sent by users hosting their mail at services like Gmail, e.g.

From: x@gmail.com on behalf of John Doe <john@doe.com>

This is a very common occurrence, and it detracts from the utility of X1 -- I end up keeping Outlook desktop search enabled just for this use-case.

I filed a bug report with X1 in 2007 and then again six years later in 2013 when version 8 was released.

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