retchmail is a small MRA written in C with the primary objective of being fast. It currently supports only the POP3 protocol with SSL support. Unlike fetchmail, retchmail lacks many features and isn't particularly robust. However, its unique features include the ability to retrieve from multiple remote mailboxes simultaneously, the policy of retrieving smaller mail before larger ones and the feature of downloading more than one e-mail message simultaneously. These features are clearly targeted at achieving high mail retrieval speeds. In fact, retchmail claims to be up to five times as fast as many other MRAs in existence.
retchmail is free software licensed under the GNU LGPL. It is written and maintained by Avery Pennarun and Patrick Patterson.