Mozilla Browser - How tell T-bird a daily e-mail news digest is NOT a scam

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How tell T-bird a daily e-mail news digest is NOT a scam

kaplan3jiim@example.com

2007-11-26, 1:12 pm

I'm using Thunderbird 1.5.0.13. The last update was several months
ago, but beginning about two weeks ago every day when I get an e-mail
digest from the Chicago Tribune, it warns me that it things "this is a
scam". I keep telling it no, but each day the same message pops up
above the e-mail. The sender address is always the same; I don't have
a past message, but the "reply to" address has some additional numbers
in it and may change daily.

Is there any way to permanently convince Thunderbird this message is
not a scam?

TIA

Jim