In the ongoing battle against spam. We have taken some actions to reduce the amount of spam traveling on our network. To be sure your email reaches our network you (mailserver) have to comply to the following rules:

• The connecting IP address must have a PTR record
• IP address should not listed in a DNS blacklist
• Senders domain needs to resolve
• Senders domain needs to have MX records
• 4.x.x status should be a temporary error (we use greylisting)

But don't worry, virtual all mailservers are configured to comply to the above rules (as stated in the RFC). But if in case your email is being blocked by our mailservers with one the above errors you should contact the maintainer of the mailserver.

It also might be a good idea to ask your mailserver administrator to ask him to setup SPF records for you. This will even lower the risk that your email is being blocked.

If your email was rejected by the dnsbl.spam.digitalus.nl DNSBL you can request your IP being delisted. If you IP was listed in other blacklists you have to contact the maintainers of these lists. To delist an ip you can fill in this form. After you filled in the form correctly it will be automaticly removed within one hour.

It's possible to request your mailserver being added to our whitelist. Your mailserver administrator should fill in this form.