Solar Fire supports two different email protocols.
MAPI is a mail automation protocol that allows third party programs to automate the generation of email. All Microsoft email programs (e.g. Outlook and Outlook Express) and Eudora are MAPI compliant, for example.
To get the full benefit of MAPI compliance you may need to ensure that the MAPI options are activated in some email programs, for example in Eudora Pro v3, you may need to go into the Tools / Options menu item, find the MAPI category, and ensure that “Use Eudora MAPI server” is switched to either “When Eudora is Running” or “Always”. If you are unsure about any of these options, you should consult the documentation of your email program (e.g. search for “MAPI”), or contact the manufacturer of your email program.
A different mail automation protocol is the Mailto protocol. If you use webmail (e.g. Gmail) this protocol will probably suit you better.
See Email Preferences for more information.