Queue, Throttle, Send SMTP email through multiple providers. Automatic re-send when non-delivery received.
Configure a single mailbox to collect non-delivery messages. Setup each sending mailbox to forward any messages received to that single mailbox. The plug-in accesses that mailbox using the POP3 protocol. User name a password for the POP3 mailbox are configured in the settings page.
No limit really, but we have tested in excess of 20 simultanious SMTP queues
Yes. also it has been tested with MSN, Dreamhost, Go Daddy, and self hosted SMTP servers