This domain is a service domain used only by MailUp customers to include images and links in their mailings
MailUp is an email service provider with 8.000+ legitimate clients that supports only permission-based email marketing and with very strict anti-spam policies (http://www.mailup.com/anti-spam-policy.htm)
Our Compliance department monitors and assesses all outbound traffic to ensure that our customers comply with requirements.
We strongly encourage reporting any abusive campaign sent from the MailUp infrastructure using the appropriate channels:
- Email to firstname.lastname@example.org (MailUp's abuse desk address)
- Fill our spam report web form: http://www.mailup.com/contacts/form-spam.htm
and our Abuse Desk will take quick and appropriate action.
More info at http://postmaster.mailup.com