Mail app on iPhone
I keep getting flooded with no sender emails. Does anyone know how to make this stop?
Question marked as
Find out which account you are receiving them from (eg Yahoo!!) then try to block them at source, maybe with Rules. That requires signing into your mail account on a computer or ipad usually
Do a web search, EG "spam emails with no sender in Yahoo!"
Rules will vary with the provider but you have to identify a common denominator in the mail header , message body, subject etc.
It is not something you can control on your iphone.