You can't fake the IP address you connect from. You can't fake the email address you're sending to. You can't fake the account you're using to send. You can't fake the time that you connect.
You don't have to fake the account just make one just for this purpose. Well, time you cannot fake but with just known value of time and many other unknown variables the equation and possible solution would be useless, practically.
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You can't fake the IP address you connect from. You can't fake the email address you're sending to. You can't fake the account you're using to send. You can't fake the time that you connect.
Then use Tor.
Have a disposable email address.
You don't have to fake the account just make one just for this purpose. Well, time you cannot fake but with just known value of time and many other unknown variables the equation and possible solution would be useless, practically.