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I am having zimbra mail server after enabling the Milter server under MTA from the Global settings for the user who is sending mail with the attachment the message is not getting delivered i mean message gets stuck in email client outbox and when check the log could observe the below
Jul  5 17:16:55 mail postfix/cleanup[29645]: 36F34E2624F: milter-reject: END-OF-MESSAGE from unknown[59.99.11.186]: 4.7.1 Service unavailable - try again later; from=<ram@mydomain.com> to=<ram@mydomain.com.com> proto=ESMTP helo=<HPPC
for the mail with 8mb attachment but actually quota is set for 20mb for this user.
Please suggest
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Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.