Error in SMTP, can’t send emails from WordPress

I also asked my webhost to change /etc/localdomains to /etc/remotedomains

as suggested by this site: http://wenderhost.com/2007/05/22/configuring-google-apps-gmail-on-a-whmcpanel-web-server/

I’m waiting for the reply from my webhost about this so for now, if anyone has anything to help me It would be much appreciated.

the error im getting from the plug in is

[“language:private”]=>
array(13) {
[“mailer_not_supported”]=>
string(25) ” mailer is not supported.”
[“provide_address”]=>
string(55) “You must provide at least one mailer is not supported.”
[“execute”]=>
string(19) “Could not execute: “
[“instantiate”]=>
string(36) “Could not instantiate mail function.”
[“authenticate”]=>
string(35) “SMTP Error: Could not authenticate.”
[“from_failed”]=>
string(35) “The following From address failed: “
[“data_not_accepted”]=>
string(30) “SMTP Error: Data not accepted.”
[“recipients_failed”]=>
string(56) “SMTP Error: The following SMTP Error: Data not accepted.”
[“connect_host”]=>
string(43) “SMTP Error: Could not connect to SMTP host.”
[“file_access”]=>
string(23) “Could not access file: “
[“file_open”]=>
string(33) “File Error: Could not open file: “
[“encoding”]=>
string(18) “Unknown encoding: “
[“signing”]=>
string(15) “Signing Error: “
}

well I’m hoping for any sort of help.

Thanks in advance.