You can get a cheap VPS on the internet that you can use as a relay (home -> VPS on another port than 25, VPS -> internet on port 25).
Or use some delivery systems (mailchimp or other) or use a mail account (gmail, O365, etc).
https://wiki.zimbra.com/wiki/Sending_ma ... rnal_relay
Discuss your pilot or production implementation with other Zimbra admins or our engineers.
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