The MarshallSoft Client Mailer is email marketing software that sends personalized email, newsletters, invoices, and notifications to a permission based mailing list from a C/C++ program. Easily check responses for bounced email and replies (REMOVE, CONFIRM, OPT-OUT, etc). Send HTML and text email with multiple attachments. Uses multiple connections for fast mailing. Supports most Windows C/C++ compilers. Royalty free.