I don't know whether it is a MUST that smtp auth + tls should be applied together to make auth works. But in your previous post, you require me to do so. Anyway, please notice that it was another error if I use both smtp auth + tls. Thunderbird complaint that the zimbra server doesn't support EHLO command.
I tried to
c:\> telnet 202.175.x.x 25
220 safp.gov.mo ESMTP Postfix
ELHO host
502 Error: command not implemented
That means now I got 2 diff problem sending from Internet.
Without TLS, it is Relay Access Denined
With TLS, it is "502 Error: Command not Implemented".
Both would not happened inside the subnet of the Zimbra Server.
Thomas |