Github dislikes email “aliases” so much that they will shadow ban your otherwise normal activities for months, and once flagged, support will request not only a “valid” email domain but also that you remove the “alias” email from the account completely.
I dont think so. I get my self hosted aliases banned. They must read the dkim/spf/dmarc or other types of headers against a base of mainstream email providers
Wouldn’t that ban self hosted email period?
Depends on what header they read and how