E-mail settings saved successfully. But error occurred while trying to check connection with mail server - Problem connecting to mailbox.

E-mail settings saved successfully. But error occurred while trying to check connection with mail server - Problem connecting to mailbox.

I know this topic has been covered before but I'm at a dead end.  New install of ServiceDesk MSP on AWS running on Ubuntu 14.4.  I also have an iRedmail server running on AWS for email.  I have been unable to add inbound mail using any mail protocols (IMAP, POP, POPS, Etc) using the external IP, AWS hostname, mail hostname, private IP address, etc..  I am able to telnet from within the AWS private network from the servicedesk host to the mail server as well as externally.  All ports are open on the firewall and Im able to connect to my mail server with mail clients without any issue.  Can anyone provide any guidance?  Thanks!


              New to ADManager Plus?

                New to ADSelfService Plus?