Question : Email sent to Tiscali email addresses bouncing with No PTR record error

Suddenly my client is unable to send emails to Tiscali email addresses with an immediate bounce back error of
"SMTP error from remote mail server after initial connection:
    host mx3.uk.tiscali.com [212.74.100.149]: 554 imp-8.mail.tiscali.it  Message declined - No PTR record found for xx.xx.xx.xx" where xx.xx.xx.xx is my server IP address. The domain name is hosted on a dedicated server, so has its own IP address and I am using the SMTP service on the server for sending mail out, both which resolve to the same IP address xx.xx.xx.xx
My DNS records are set up correctly, with an MX record for the mailserver and a TXT record (as advised by my server provider). What could be going wrong as its becoming a real pain?

Answer : Email sent to Tiscali email addresses bouncing with No PTR record error

http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel(office.11).aspx

The reason you got the error after adding the "Imports" statement is that the Microsoft.Office.Interop.Excel Namespace also contains a FONT and a POINT.  Before you added that, Visual Studio knew that you wanted to use the System.Drawing namespace...once you added the imports, it wasn't sure anymore, so now you have to tell it what you want.