PHP e-mail configuration?

Hi,
I am running forum supported by vBulletin.
It is appears that I have a problem to send E-mail from vBulletin.

I guess, this problem is because of incorrect configuration of PHP on server.
My host has a new server. My forum was transferred from an old to a new server. It may happen, that host did not configure PHP e-mail options right.

Host is asking about error message. But, I have not any error message.
Just e-mails from vBulletin are not going through.

What exactly I should ask my host?
Where to look for PHP e-mail configuration?
What to configure?

Thank you.

 

 

 

 

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