Is my email delayed by the filter.
Delays of 10-15 minutes are very common shortly after setting up Spamexperts for your domain.
This is a result of the self learning system of the filter: it does not know the receiving mail server yet, and will grey-list the e-mail first. The next delivery attempt of the sending mail server (after a minimum of 10 minutes), the filter will accept the e-mail and process with the next validation steps.
After receipt of 5-10 e-mails, the receiving mail server will be recognized and the delay disappears.