Exchange 2013 cu10
my mail server is working fine. send/receive internally and over the Internet.
i'm currently configuring an IMAP server running on linux and from that server i can receive an email from Outlook clients (note: i created an MX record in my DNS server for this IMAP server). now when i send from this IMAP server to Exchange users, i get access denied coming from my DNS servers. it isn't going to the CAS server.
question now is, should i create an MX record for my Exchange server to allow the users in my linux box send emails to my Exchange users? since i already have an MX record for my domain when Internet DNS servers are queried, would this additional MX record (which reside internal).
regards,