An MTA (Mail Transfer Agent) is software that provides the sending (not receiving) of email messages from one computer to another.
An MTA can be seen as a post office for email. Other terms that often refer to MTAs are mail servers or mail exchangers. The most used MTAs are:
- Microsoft Exchange Server
The last three are used for Linux for sending email. DirectAdmin and cPanel use Exim and Plesk uses Postfix. Of the above MTAs, only Microsoft Exchange Server provides both sending (MTA) and receiving (MDA) of email. Usually, a separate MDA is used for receipt.
The VPS mail service
Our VPS mail service is not an MTA and cannot send mail on its own. In order to use the VPS mail service, an MTA is therefore required.
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