New
#11
Spam volumes are generally correlated to address leakage via database hacks, the specific email provider ls less relevant.
The easy way to check is on... Have I been Pwned or...Firefox Monitor
Redundancy across any critical online service is important, whether it is email, banking, ISP's et al. Sharing of infrastructure is becoming more prevalent to save costs, so be careful with who you choose as 'plan B' lest it effectively ends up being the same as plan A...
I've noticed my mobile apps for banking and email working when there have been severe outages on web access, so that's an alternative route worth having.