wine users - Mar 2005 - Small mail agent ?

Hi,

the proprietary FileMaker software -- which runs under an old WINE release --
requires a `mail sending program' or library. Apparently, Mozilla
Thunderbird
could fullfill this role.

Unfortunately, the versions where Mozilla Thunderbird works are the
newer versions where the proprietary FileMaker software doesn't.

A simple fix could be a very simple mail sending program or library
which would be compatible with the way Microsoft Windows implements
sending mail running under WINE.

Having almost no non-UNIX experience I am bit lost there.

Any suggestion ?

thank you.