D. J. Bernstein
Internet mail
SMTP: Simple Mail Transfer Protocol

The SEND, SAML, and SOML verbs

SEND, SAML, and SOML are just like MAIL. The only difference is that This profusion of verbs serves no purpose; the concept of a mailbox is already broad enough to include any type of delivery that the recipient wants to set up. SEND, SOML, and SAML are rarely implemented in practice.