Rewrite the MTA-independent part of MTA.rst.
- Assume less knowledge of mail admin (but still fairly demanding). - Use 'MTA' instead of 'mail server' to distinguish 'software' from 'host'. - Use 'same host' configuration as example. (The configuration with lmtp_host == smtp_host == mail.example.com doesn't really make sense, since they will be equal only if they are both 'localhost'.) - Give explanations of each of the 6 parameters. - Provide a link where the confused can find help channels.
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