Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail/Parse.pm line 94.
Unsuccessful stat on filename containing newline at /home/webmail/cgi-bin/admin/GT/Template/Parser.pm line 113.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail/Parse.pm line 94.
Unsuccessful stat on filename containing newline at /home/webmail/cgi-bin/admin/GT/Template/Parser.pm line 113.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail/Parse.pm line 94.
Unsuccessful stat on filename containing newline at /home/webmail/cgi-bin/admin/GT/Template/Parser.pm line 113.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail/Parse.pm line 94.
Unsuccessful stat on filename containing newline at /home/webmail/cgi-bin/admin/GT/Template/Parser.pm line 113.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail/Parse.pm line 94.
Unsuccessful stat on filename containing newline at /home/webmail/cgi-bin/admin/GT/Template/Parser.pm line 113.
Argument "" isn't numeric in gt at /home/webmail/cgi-bin/admin/GT/Mail.pm line 158.
A fatal error has occured:
    GT::Mail::Send (19400): SMTP: Unspecified communications error: '501 5.5.4 Domain name required for sender address 
'. at /home/webmail/cgi-bin/admin/GT/Mail.pm line 298.

Please enable debugging to find more information about this error