Pegasus Mail
It has all the options that I had with Agent on my Windows XP system. Agent failed to work on my Windows 7 64bit due to a MAPI problem.
Here's my Pegasus window:
It has a nice, though hard to use, filtering system. And setup was very good but not intuitive.
The options are extensive, but again something seems missing, like:
- Notification Options, like turning off delete confirmations
- Setting compose-email editor options, like setting default font and size