I've installed Bugdar on a server where PHP is running in safe mode.

Instead of confirmation or notification emails I only get an error message on the screen, saying
"SAFE MODE Restriction in effect.
The fifth parameter is disabled in SAFE MODE".

As a workaround I simply commented out the fifth param at line 319 in framework/mail.php:
//if (mail($tostring, $subject, $body, $headers, "-f {$from}"))
if (mail($tostring, $subject, $body, $headers))

Everything seems to be OK for me.
(What feature have I lost?)

Just to be precise:

Version Information
Bugdar Version 1.2.2
PHP Version 5.2.0-8+etch10
MySQL Version 5.0.32-Debian_7etch8-log
Web Server Apache

Server Options
MySQL: Maximum Packet Size 16776192
MySQL: Maximum Upload Size 16777216
MySQL: Full-Text Search Minimum Word Length 4
PHP: Safe Mode Yes
PHP: Register Globals No
PHP: Magic Quotes GPC Yes
PHP: Magic Quotes Sybase No
PHP: Gettext Installed Yes