From ACME Technologies:
MondoMail/FM is a FileMaker Pro (Mac/Win) plug-in for sending and receiving e-mail. Send your customers newsletters, mass mailings, invoices and marketing materials. Includes full support SMTP (including authenticated SMTP), POP3 and IMAP. Complete support for HTML-formatted e-mail, attachments, custom e-mail headers, and POP3/IMAP over SSL/TLS.
What's new in this version:
Support for secure SMTP email (SSL/TLS) added. A previous version added imap/pop3 SSL support