Exim is an MTA. A Simple Message Transport Protocol (SMTP) mail server.
Exim is highly configurable and has many powerful and advanced configuration options including the abiliy to store lists of users, hosts, domains etc. in simple text files, databases, Lightweight Directory Access Protocol (LDAP) directories and “callouts” to other programs or scripts on the same computer. Exim is common in large scale Unix/Linux environments and ISPs (Internet Service Providers), moving millions of messages per day, but is equally suitable for small networks or individual workstations.
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