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not be used on port 25, reserved for SMTP
*LMTP uses LHLO verb instead of EHLO or HELO used in (E)SMTP
* ESMTP requires a single status for the entire message body. LMTP requires a response for each previously successful RCPT command. That is, in case of multiple recipients, after the body of the message has been transmitted, LMTP can still fail for some recipient while succeeding for the others. With this facility, LMTP can fail if a user is over quota without the burden of generating bounce messages.

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