MTA Mail Transfer Agent. Generally the mail server you use to send/receive email.
MUA Mail User Agent. The program you use to check your email. Also referred to as the email
Post send send a message to a mailing list for distribution
Digest many messages compiled into a single email, generally sent out once a day.
Subscribe to add a address to a list
Unsubscribe to delete a address from a list
Bounce a undeliverable email that has been returned to a list
Archive a collection of past list messages
Email Client the program you use to check and send email.
VERP Variable Envelope Return Paths, a inefficient method of sending list email but does handle
bounces better. Not currently an option at Listserve.com.
Header A part of email that is mostly hidden from you, the headers of a message contain a variety
of information. Whenever you have an issue with email it's best to have the full headers available
when you contact support.
Umbrella List a list that has other lists as its members.