ezmlm issues with php mail command

Hi.
(please excuse my lame english)

I'm trying to make ezmlm work with PHP. 
Not for the subscription/unsubscription part but for the e-mail sendings, as I wish to let my website publish itself a monthly information e-mail.
I tried quite hard to do that with the "mail" command of PHP, but it's like if ezmlm couldn't accept any of the emails sent with php : line breaks ? spaces ? origin of the mail ? I tried a lot of things but even the simpliest mail has no effect at all. So I guess it's the mails that php mail command generates that are badly written form ezmlm's point of view. Of course, I have no problems sending a php mail to any adress that is not a mailing-list, and I also have successfuly used ezmlm with my mail client.
So...
Is there a well-known workout ?
Is there a way for php to send an ezmlm mail without the php mail command ?

I didn't find anything in the manual pages but as I said, my english is not very good so perhaps I missed something.
jn