Hi, I have a ZCS mail server and it is terrific. Our company has a CRM tool that has a simple PHP emailer. And I am trying to set up the crm webmail program to receive incoming email into the CRM. The webmail settings ask for mailserver/username/password and these options:

TLS or no TLS
Validate SSL or Do Not validate

I have tried all combos but can not get the incoming mail set up. Outgoing is fine.
Any suggestions and is there a server log I can check to see why this is not connecting?
The CRM is vtiger BTW

Thanks, JR