Plesk 7.5 is the CP for my Webfusion Linux VPS. A new customer has discovered that enquiries from their website email form are not being received. It appears incoming emails from the form get blocked by their anti-spam filter service. I use the same form on several sites and no other clients have a problem, so I was wondering if it might be down to me incorrectly setting up the VPS host name?. There is a field in 'Server Preferences' for 'Full Hostname'. I read that I should enter a fully qualified domain name in this, so I set up a sub-domain for our main domain name and used that, e.g. server.example.com In email headers from the web form, this does appear, e.g. FROM: server.example.com (unknown [212.241.***.***]) or FROM: 212.241.***.*** (EHLO server.example.com) (212.241.***.***) My concern is, the IP address 212.241.***.*** resolves to the VPS providers, e.g. lvps212-241-***-***.vps.webfusion.co.uk. So... I was wondering, should I: 1) Ask my VPS provider to change the IP address to resolve to 'server.example.com', or 2) Enter 'lvps212-241-***-***.vps.webfusion.co.uk' as the hostname, or 3) Do nothing as it probably has nothing to do with any of this! Any help from mail server gurus would be much appreciated.