Typically when a domain gets flagged or blacklisted, the best course of action is to simply purchase another domain and add it as an add-on domain to your install.
After it's been configured, you would then be able to use any domain interchangeably for your tracking links, pixels, and post-backs, so you can swap out campaign links at your own pace.
If you are self-hosted, you can do one of two things:
1. Change your domain altogether
2. Create another separate installation.
Please submit a support ticket for assistance with getting this updated.