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These are philshing emails, they appear to be from accounts but are not, they are faked. The way email works you cannot stop this. You can even send a fake email from herehttps://emkei.cz/
As you can see there you can specify any from address to make it look like its from anyone.
Whilst they are a pain, as long as you just delete them and above all do not do anything it tells you to do you are in no danger.
But the ability for people (scammers) to send these cannot be stopped, its the way email works.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.