Changing Site Email address causes sending erro

Hi, I tried changing the site information email address from [email protected] to [email protected](mydomain).com and now when I complete checkout I get a message: Unable to send e-mail. Contact the site administrator if the problem persists. The drupal log says: Error sending e-mail (from [email protected](mydomain).com to [email protected]). This seems odd as it advises you to use an email address ending in your domain name. Why would [email protected] work and not my own? Do I need to install a separate mail module? Thanks.
Installed Phpmailer module and now works fine!

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