Proper noun
SMTP
(Internet) Initialism of Simple Mail Transfer Protocol (a de-facto standard for email transmission.)
One bug in an SMTP server can open up the whole machine for intrusion. Wietse Venema
According to RFC 1428, the original RFC 821 definition of SMTP limits Internet Mail to lines (1000 characters or less) of 7-bit US-ASCII characters. Source: Internet
A mobile user may often be on a network other than that of their normal ISP, and will then find that sending email fails because the configured SMTP server choice is no longer accessible. Source: Internet
A receiving SMTP server may be the ultimate destination, an intermediate "relay" (that is, it stores and forwards the message) or a "gateway" (that is, it may forward the message using some protocol other than SMTP). Source: Internet
All of these products also support POP, IMAP, and outgoing SMTP. Source: Internet
A MUA knows the outgoing mail SMTP server from its configuration. Source: Internet