Reply e-mails repeating

Last week my web host moved my site from one of their servers to another. Since then my WPSP has not worked properly. After a ticket is submitted (via e-mail) the plugin will now send a reply e-mail and create a new ticket for their submission every 5 to 10 minutes. I have tried disabling e-mail piping (which disables e-mail altogether but at least stops the e-mails) and I have tried disabling and enabling the plugin but when I have e-mail piping turned on it will continue to send out reply e-mails and create new tickets for whatever the latest e-mail submission is.

Any ideas?