Limit number of emails send by PHP mail function

[mislav]

Linux 2.6.32-5-amd64 x86_64

Distributor ID: Debian
Description: Debian GNU/Linux 6.0.6 (squeeze)

ISPConfig 3.0.4.6

Email - courier

Yes - i can send email through webmail.

Hello, as title says, I'm trying to limit number of emails send by php mail function.

Spammers are giving me a hard time and I'm looking for solution how to limit this server-wide. So far I'm unable to find solution on google and I've found only this:

http://www.cyberciti.biz/faq/postfix...ng-email-rate/
http://serverfault.com/questions/432...tos-6-plesk-10

Altough this is not reflecting sending mail with php mail function. Thanks in advance