The program always crashes when a gmail account is configured and the author doesn't seem to care about this problem (look at the url provided) so I think that this USE flag should be masked until something changes. Reproducible: Always
*** Bug 258315 has been marked as a duplicate of this bug. ***
Sorry about the duplicate - don't really know how I managed to do that...
mail-notification-5.4-r1 works for me very well with gmail inbox. Please, do not mask
Are you still suffering this on a new created user account? (maybe the problem is caused by some odd configuration) I have checked this package in some distributions (fedora, mandriva, opensuse, debian, ubuntu and arch) and I have failed to see any problem/fix related with this :-/ Please also try with just bumped mail-notification-5.4-r2 Good luck!
Also check you have "gnutls" USE flag disabled in gnome-vfs to not suffer bug 295974
Please get back to us