errors when attempting to send

[RangerFox]

I can get to the compose screen..but when I try to send I get the
following:

Warning: Undefined index: mailer in
/home/soulhadji/public_html/webmail/horde/imp/compose.php on line
671

Warning: Undefined index: mailer in
/home/soulhadji/public_html/webmail/horde/imp/compose.php on line
671

Fatal error: Call to undefined function: send() in
/home/soulhadji/public_html/webmail/horde/imp/compose.php on line 672

I am using the lastet cvs of php4 and the latest cvs of horde and imp wiht
my php as a module in apache 1.3.14