411 REFERENCE · Wikibooks
Guide to Unix/Explanations/Mail Server Overview/Mail Server Related Terminology
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
/Mail Delivery Agent/
/Mail Retrieval Agent/
/Mail Submission Agent/
/Mail Transport Agent/
/Mail Delivery Subsystem/
/Message Handling System/
/Message Handling Service/