Usually when I set up email from a share hosting provider ... the email side of things requires that I set SMTP Authentication on before mail can be sent or there is an error.
I would like to do this as well with zimbra.
I have a client sitting on the local network, and one sitting on a network in another location. I am trying to send mail from email@example.com to firstname.lastname@example.org.
I am using thunderbird.
When I send from client on same network I get below message
"Sending of message failed.
An error occurred sending mail: Unable to authenticate to SMTP server mail.fshzimbra.lan. It does not support authentication (SMTP-AUTH) but you have chosen to use authentication. Uncheck 'Use name and password' for that server or contact your service provider."
When I send from client on external network it does ot mater if smtp auth is on in client or not the mail is sent
What I want is smtp auth enabled on the server just like how it would be if i purchased hosting from a 3rd party.
How can i achieve this? Thanks.