MTA: Mail server
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Overview
- Do not confuse the different parts of an entire mail system. The MTA (Mail Transfert Agent) is responsible for the delivery of messages across the network, whereas the MDA (Mail Delivery Agent) deliver finally the email to the user's mailbox. On some systems, the MTA and MDA are one and the same. But most software packages act as either MDA or MTA.
- Mail servers can be very tricky about the DNS / reverse DNS configuration. In particular your mail server should have a reverse DNS configured. For more information see the wiki page about Hostnames, Domains.