Message Size Violation

Hi all I'm currently using Zimbra Open Source version 7.1.4. Recently i found out some of the mail cant be send out and there is a return error for example <Kai_Shen_Khor@DELL.com>: host smtp-proxy.tm.net.my[202.188.0.174] said: 550
5.7.0 Message Size Violation (in reply to end of DATA command)
Whats its mean by the error. Thanks

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Originally Posted by xwings10

Whats its mean by the error.

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I guess that the mail proxy you're (apparently) using doesn't allow messages of that size to be sent through that server.