Hi,
I run a plesk 11.5.30 on CentOS 6 115130819.13 (x64)
Concerning my environment
i've only one domain on my server, but using multi-subdomains in SSL. IPv4 and Ipv6 are activated.
When i try to send email from a PHP site from a sub-domain (mail function), no mail are sent.
lsof...