PHP and/or linux issue?

Not too sure which I need to pursue - I have a script that uses the mail() function. On my windoze box, I don't have the problem, but I understand why I don't. On the linux box, I sometimes get a legitimate address rejected because the routine does a lookup of the mx-rr.domain.com of the e-mail address. When it doesn't find an mx record, it rejects it with a 501 error. Windoze doen't use the mx lookup, so it attempts to send the email and it works. My question is this: How do I tell the mail() (or sendmail) not to do the mx record validation? Thanks. -- Gaylen gfraley5@earthlink.net Home http://www.gaylenandmargie.com PHP KISGB v2.21 Guestbook http://www.gaylenandmargie.com/phpwebsite