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Click forward on the email then go into the subject area and copy the non forum email address which will show in the From: under the "---Oritinal Email----" heading.
If I sent you an email through the forum, and it reached you, when you pressed forward or reply you would see
From: Grandpas Grub @ eggheadforum.com [mailto:email@example.com]
When pressing reply the return address would be
Grandpas Grub @ eggheadforum.com [mailto:firstname.lastname@example.org]
If you press forward then you can copy the kentja email address and paste it into the "To:" section and the email should process just fine.
The proper email address will also show in when looking at the email header information.