Hello guys.
As I understood you talk about two different problems.
sensualsophie
In general, you need to solve this with your hosting company. Or try to search solution in google. But I will try to answer:
If your mail server is located on the same server where php is installed, then you need to indicate in php.ini file the path to the local mail server. Something like this:
[mail function]
SMTP = smtp.isp.net
sendmail_from =
me@isp.netbaxter
Cron job must be setup. Otherwise system will not be able to send emails.
If your site sends so much emails per day, may be you have a good activity? Or may be there are some spam problems from your mail server. In any way you need to check this.
Thanks