Extended SMTP (ESMTP), sometimes referred to as Enhanced SMTP, is a definition of protocol extensions to the Simple Mail Transfer Protocol standard. The extension format was defined in IETF publication RFC 1869 (1995) which established a general structure for all existing and future extensions.
ESMTP defines consistent and manageable means by which ESMTP clients and servers can be identified and servers can indicate supported extensions.
Read more about Extended SMTP: Extensions, 8BITMIME, ETRN, SMTP-AUTH, SMTPUTF8
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“Only very slowly and late have men come to realize that unless freedom is universal it is only extended privilege.”
—Christopher Hill (b. 1912)