Mail header

[rigi2]

I want to ask a simple technical question. Normally, php mail () function is written like this:

mail ($to, $subject, $message, $header, $from)

in order to send a mail.

I just want to know why in some email addresses I've sent they didn't received it. Is it the mail server who filters it? Am I locking an important header or something? any help will surely appreciated.

[Truti]

If the mail(); function i corectly written i send you mail like a normal from a client, over the SMTP server you just add'ed (you know that!).

There is some mail providers there by dafualt have disablet to delevery for mails, with a not legal mail address:

e.g.
Ant Michael (not vaild!), [e-mail] (vaild!)

systems like this often just work with a "@" check, if a "@" is found in the string, the mail is vaild!

[rigi2]

ok, thanks I got you!

follow up question: Do php have a whole/valid/complete parameters for sending mail, so that mostly all SMTP servers can accept it.