PHPMailer SMTP Authentication Between Domains Hosteed on Same WHM Server

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http://forums.cpanel.net – I have a setup where I need a PHPmailer type script to be able to authenticate SMTP from other domains on my server. E.g. The script resides on DOMAIN A at IP and needs to authenticate SMTP on DOMAIN B at so DOMAIN B's IP reputation and Domain Keys are used to send to their subscriber list. At present I can only connect via SMTP within DOMAIN A It's a managed domain environment and I am the only user on the system. So I am not worred about SMTP securtiy between the domains and could even benefit from cross domain PHP script execution at times as well. Thank's in advance f (HowTos)