Configuring Outgoing MTA Routing for External Email Account in Zimbra

[l.ansaloni]

Dear community members,

I have recently added an external email account to a user in Zimbra via IMAP. I would like to be able to send emails from this account using an external SMTP server, and I understand that I need to configure outgoing MTA routing for this particular address or external domain.

Can someone please guide me on how to configure outgoing MTA routing in Zimbra for an external email account? I am using the latest version of Zimbra (Release 9.0.0.GA.4178.UBUNTU20.64 UBUNTU20_64 NETWORK edition, Patch 9.0.0_P27.).

Thank you in advance for your help.

Lorenzo