We are trying to enable external users to send & receive e-mails through their Gmail accounts.
I have setup a Gmail Imap account in Outlook and opened ports 995 & 465 on our TMG 2010 firewall (Internal > External- All users). This allows me to send e-mails through the Gmail account.
The error message I encounter in Outlook when attempting to receive e-mails is: "Task 'Synchronizing subscribed folders for firstname.lastname@example.org.' reported error (0x800CCC0E) : 'Outlook cannot synchronize subscribed folders for email@example.com. Error: Cannot connect to the server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'"
We do not use TMG client software.
Do I have to add another TMG access rule to allow incoming IMAP connections or am I missing something more fundamental here?