Fetchmail is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand or permanent dynamic-address TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP3, IMAP4r1, ETRN
... [More], and ODMR, all with various authentication variants, and TLS/SSL security with certificate verification.
Fetchmail retrieves mail from remote mail servers and forwards it via SMTP, LMTP, or to a local delivery agent. Mail can then be read by normal mail software such as mutt or alpine. This setup allows all your system MTA's filtering, forwarding, and aliasing facilities to work just as they would on normal mail. [Less]
A highly scalable/configurable Mail platform allowing users in a domain to be distributed across multiple hosts, has multiple queues and uses qmail as MTA.
Also provides virtual domains/users in MySQL. No patching of qmail required. A full-featured mail server providing ESMTP, IMAP/POP3, QMTP
... [More], QMQP, DKIM, DomainKeys, etc
In tests carried out by users, IndiMail's multi-queue architecture outperforms postfix in mail inject rates.
IndiMail allows extending a domain across multiple servers. This feature also allows you to setup a domain with a heterogeneous mix of mail servers.
Read more about IndiMail at