Email send error warning

[PortraitArtist]

Hi, Zen Gurus,
I am having a problem with emails not sending from zen cart.
The email is working on the server fine as I can send email to this address from my local outlook program
I am using the exact same settings as my other site, but no email notifications coming from ZenCart.
I am running ZenCart 1.3.8 fresh install.
I am using sendmail

Server OS: Linux 2.4.30-grsec
HTTP Server: Apache
PHP Version: 4.4.4 (Zend: 1.3.0)
PHP Safe Mode: Off
Max Size: 2M POST Max Size: 55M
Database Host: localhost (127.0.0.1)
Database: MySQL 4.0.27-standard

Everything running fine except no emails coming through the admin.
When I tried to send an email from the admin to the trial customer address
this warning come up:

Warning: escapeshellcmd() has been disabled for security reasons in /home/embroide/public_html/Gifts/includes/classes/class.phpmailer.php on line 408

Warning: Cannot modify header information - headers already sent by (output started at /home/embroide/public_html/Gifts/includes/classes/class.phpmailer.php:408) in /home/embroide/public_html/Gifts/manage_gifts/includes/functions/general.php on line 21

I don't understand what the above lines mean:
This is the Line 408 in class.phpmailer.php:408 file:
$sendmail = sprintf("%s -oi -f %s -t", escapeshellcmd($this->Sendmail), escapeshellarg($this->Sender));
I do not find the general.php file; The closest to that is functions/functions_general.php

Please help me figure out what could cause this problem.
Thank you,
Portrait Artist

[DrByte]

Warning: escapeshellcmd() has been disabled for security reasons in ...

You will either have to talk to your hosting company to have them change their security settings, or else change your selected Email Transport Method in your Admin->Configuration->Email Options

[PortraitArtist]

You will either have to talk to your hosting company to have them change their security settings, or else change your selected Email Transport Method in your Admin->Configuration->Email Options

Thank you Dr. Byte to look into my email problem.
Since my knowledge of the server functions is very limited, I tried to copy the settings from our other ZenCart (on Vodmochka.com).
In frustration I did try all the different settings in the email options and the PHP method is working. My only concern is security. I don't know if the server setting for - PHP Safe Mode: Off - would make our website vulnerable, if we use the PHP mail method.
I can ask my service provider to change the settings to be able to use sendmail, if that is more secure, they are very helpful.
Maybe you are laughing at my questions, but that is how little I know about Linux, Apache and PHP.
Thank you again to look into this problem.
PortraitArtist.