Outgoing SMTP Authentication on Zimbra 8.5

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INFORMATION

SMTP Relay     : mailrelay.example.com
username          : relay@example.com
password          : RelayExample
port                    : 587/465


echo mailrelay.example.com relay@example.com:RelayExample > /opt/zimbra/conf/relay_password
postmap /opt/zimbra/conf/relay_password
postmap -q mailrelay.example.com /opt/zimbra/conf/relay_password
zmprov ms `zmhostname` zimbraMtaSmtpSaslPasswordMaps lmdb:/opt/zimbra/conf/relay_password
zmprov ms `zmhostname` zimbraMtaSmtpSaslAuthEnable yes
zmprov ms `zmhostname` zimbraMtaSmtpCnameOverridesServername no
zmprov ms `zmhostname` zimbraMtaSmtpTlsSecurityLevel may
zmprov ms `zmhostname` zimbraMtaSmtpSaslSecurityOptions noanonymous
zmprov ms `zmhostname` zimbraMtaRelayHost mailrelay.example.com:587

Ref:
https://imanudin.net/2014/09/18/how-to-configure-outgoing-smtp-authentication-on-zimbra-8-5/

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