mail() does not work

[something else]

Do imap_mail works on yahoo br0?

errrrr maybe lol

[analyzer]

Do imap_mail works on yahoo br0?

[something else]

yahoo`s a b**ch... seen so many sites that wont accept yahoo :/
PHP: imap_mail - Manual

[analyzer]

Any guide from the profesional coders here? I have used the func. mail() in my registration to send the password. In my first test, it works. but in the sec0nd test it doesn't, also in 3rd test it doesn't work. . I have used yahoo. Can anybody help me to fix this problem? When does a mail() func. Do n0t work?