Hello,
I have problem with understanding the exchange architecture when I receive an email it will reach the edge server with port 25-SMTP then it will be forwarded to the mailbox, if I am using IMAP or POP3 then the communication will happen on the CAS server though IMAP + POP3 Ports and then will be forwarded to the mailbox server, I want to know where to put my public IP address and who are going to have the mail.contoso.com record? I am confused between the edge and the CAS server, further more if someone can explain to me SMTPS traffic where it will be routed, if I did mistake plz fix it.
I followed this article https://technet.microsoft.com/en-us/library/bb331973(v=exchg.150).aspx
Regards,
Ayesh