This is some kind of problem with Pipedrive email. Happens to me also..
Hi @Jonas Paterson , in case the issue persists, please reach out to reach out to our Support team who will be able to quickly help you with questions regarding your Pipedrive plan.
For urgent or technical issues Support is the most adequate and quickest channel of communication. As the Community will be more focused on exchanging knowledge, best practices and ideas. Thank you!