Simple Mail Access Protocol
The Simple Mail Access Protocol (SMAP) is an application layer Internet protocol for accessing email stored on a server. It was introduced as part of the Courier suite, with the goal of creating a simpler and more capable alternative to IMAP. As of 2005, SMAP is still considered experimental, and is only supported by the Courier server and Cone client.
Source: Wikipedia — Simple Mail Access Protocol (CC BY-SA 4.0)