Email security - Watch Guard

[Jhonmicky]

Hello everyone,,
Currently my cusotmer is working with a zimbra free version for their e mail server and its osted and ruuning inside the client premise itself.
Now a days lot of SPAM and the domain getting blocked issues were coming.
So we decided to go openweb.onl/whatsapp-web/ modplus.pro/whatsapp-plus/ for an e mail security solution adn bought WatchGaurd XCS 550.
nOW IAM STRUCK WITH THE installantion and configuration of the watch guard duw to the congiguration part.
Currently Zimbra is behind the Sonicwall NSA 2400 and we need to add hte Watcg Gaurd XCS for Incoming / Outgoing e mail checker.
Please let me know what we need to do from the Zimbra side, to smoothen the amil flow, without any interruption.
Looking for the expertees help to resolve the configuration Part.


Thanks and rgds,
Jhonmicky