Hello,
We have had severe problems with SPAM attack on few domains on our shared servers resulting in the queue getting jammed because Plesk Spam filter is not able to cope up with them. The PTR setting that has been applied has definitely solved the problem of email getting stuck in to the queue. If you receive too many spams then you can either configure Spam Assassin on your account or email at windows [at] eukhost.com and we will configure it for you.
Having a PTR record is most commonly used security policy today which is followed by well know email providers like AOL, Hotmail, Yahoo, gMail, BT and many more. If your client is not able to send mails to our server then it confirmed that he/she is not able to send on any account with above providers.
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