I'm not sure how to do it on your phone, but on the equivalent desktop app, some email clients (such as Outlook) allows you to set up filters that will block mass spamming. For example:
Joebloggs19@outlook.com
Fredsmith9000@outlook.com
Bendywendy@outlook.com
all have the suffix "@outlook.com". so, instead of blocking those 3 email addresses individually, you are able to block the
@Outlook.com part, as a collective. Of course, this then results in legitimate emails being sent to your spam folder, so it then becomes necessary to set an alternative filter rule. If you get spammed by ads for viagra, bitcoin, etc from email addresses, you can set up the filter rules to pre-scan your emails, looking for VIAGRA, or BITCOIN or whatever, to then divert those emails to your spam folder. Initially, it is time-consuming, but after a while, you should reap the benefits of using filters. Use Google to search for best advice on how to use filters in your email client. I think if you set this up using a computer, the filters are done on the client servers, before you will retrieve your emails on your phone.
