From Chilkat Software:
The Chilkat ActiveX component provides objects for creating, sending and retrieving Internet e-mail. It fully supports SMTP, POP3, MIME, HTML, SSL, S/MIME, secure authentication, attachments, SSL, progress monitoring, zip and unzip of attachments, XML import/export, and is fully internationalized to handle email in any language.
What's new in this version:
Version 9.4 added CloseMailbox and CheckForNewEmail methods.