Is "@" safe in URLs?

[eluser]Deep Arora[/eluser]
I need to form a URL like:

http://domain.com/ci/index.php/controlle...domain.com

to retrieve email id from the URL...and since CI default setting in config is:

Code:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-';

is it safe to allow "@" in this permitted list?, so it become:

Code:

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_\-@';