postmaster
Sign in to saveadministrator of an email server
Connections
Internet forum
Entity
message transfer agent
Entity
email
Entity
International Standard Book Number
Entity
digital object identifier
Entity
Simple Mail Transfer Protocol
Entity
denial-of-service attack
Entity
Internet Engineering Task Force
Entity
webmaster
Entity
Request for Comments
Entity
superuser
Entity
email address
Entity
sysop
Entity
email spam
Entity
Open mail relay
Entity
bounce message
Entity
John Klensin
Entity