I am wondering how to make Zimbra Mailboxd to connect to Zimbra MTA using TLS (465). Currently this zimbraSmtpHostname is set to localhost:25, if it is standalone server. In Multiserver, it points to one of the MTA or LB. I haven't thought of TLS until the security compliance is asking it. Anyone knows or is there workaround?
Ha... I think I answer it myself: stunnel
Example.
Code: Select all
[smtp-tls-wrapper]
client = yes
accept = 127.0.0.1:11125
connect = mail.zimbra.lab:25
protocol = smtp
Code: Select all
zmprov ms `zmhostname` zimbraSmtpHostname 127.0.0.1 zimbraSmtpPort 11125
Can't use 465 as Zimbra has designated it for submission use. Stick to 25 with STARTTLS.