Topic: Help me for this situation
I've this network topology :
internet cloud --> "Mail server on ISP" --> iRedMail --> Local Network
Let say my domain is mydomain.net.
I want to send email from firstname.lastname@example.org to email@example.com, where user_a mailbox in "Mail server on ISP" only and user_b is in "Mail server on ISP" and iredMail server.
And I got error "SMTP Error: SMTP error: Failed to add recipient firstname.lastname@example.org", if I'm add user user_a in iRedMail, it will deliver to local server (iRedMail server).
I've try to set relayhost to "Mail server on ISP" , still not working. Can anybody advise me how to do it?