I have set up the latest zimbra build "Release 8.6.0_GA_1153.RHEL7_64_20141215151110 RHEL7_64 FOSS edition" and was able to send and recieve from domains such as gmail, yahoo and others.
I am planning to migrate our existing server to this one which uses, domain.co.uk so to test a new server, i made another which has his own MX record as well pointing on a different server using sample.domain.co.uk
I can recieve from domain.co.uk but i cannot send from sample.domain.co.uk to domain.co.uk
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On mailq, i receive the following error
230F442BE311 5566 Wed Jun 26 09:13:48 narutouzumaki@sample.domain.co.uk
(connect to consumercloud.co.uk[192.168.0.20]:25: Connection refused)
itgroup@domain.co.uk
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On tail -f /var/log/maillog
Jun 26 09:39:17 zimbramailone postfix/smtp[15510]: 230F442BE311: to=<itgroup@domain.co.uk>, relay=none, delay=1529, delays=1529/0.08/0/0, dsn=4.4.1, status=deferred (connect to domain.co.uk[192.168.0.21]:25: Connection refused)