Default Mail Domain Name

[fbaza]

Hi , sorry by my english, I need know which is the correct Default Mail Domain Name in SMTP properties, i have this

DNS
example.org.ar. - MX - 10 - mail.example.org.ar
example.org.ar. - MX - 20 - mail1.example.org.ar
mail.example.org.ar. - A - 0 - 192.192.192.192 (ISP 1)
mail1.example.org.ar. - A - 0 - 193.193.193.193 (ISP 2)

Server
Server Name Intranet
Server IP 192.1.1.78
No Domain Standalone

In Mailenable SMTP Properties
local Domain Name -> example.org.ar
default mail Domain Name -> mail.example.org.ar It's correct ? In the case what mail.example.org.ar dont work woul arrive mails by mail1.example.org.ar ?

Thanks