According to their Features list for version 4.x, IMAP IDLE is supported for all levels (Free, Pro and Enterprise): http://www.smartertools.com/Products/SmarterMail/Features.aspx Ultima is on Enterprise version 4.3, correct?

IMAP is enabled, but IDLE is not.  At least it's not listed as a capability when I telnet into the server.  It just lists IMAP4 IMAP4rev1.

Hello Mark and Co...  Is IMAP IDLE enabled on the Smartermail Servers?     Regards  Richard