Seems like the hackers also had access to at least some customer data. Several people I know who were also Namecheap clients, including me, received those emails. Whether that data was also stored with the upstream provider remains to be seen. Might be an even bigger deal.
What customer information did you store with that provider? Just names and emails, or was there anything else that attackers may have been able to access?
Mine was addressed with my full name in the "To:" field, so they do have our full names (but just didn't mail-merge those into the body of the message).
You and who else? If it's one of your employees credentials getting compromised this excuse isn't going to age well and will do more harm than good. I assume you're using a big provider and there would be news of others being affected.