How to install Apache worker + PHP FastCGI and PHP-FPM on Ubuntu 12.04 LTS
Apache worker suits heavily loaded web servers with limited resources because it uses less memory than Prefork. Enabling PHP support requires additional configuration.
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How to config default Return-Path in php mail
Some mail servers reject messages sent by PHP scripts with this error: (host ezylinux.com[74.xx.xxx.xxx] said: 550-Verification failed for 550-The mail server could