I keep one email a/c for personal financial affairs which I only open on one scrupulously maintained security safeguarded PC;
[password commited to memory and not stored on any computer]

but create as many secondary and disposable emails as required for multivarious websites demanding membership for access.

All fake IDs / passes and dodgy email addresses are kept listed on a word Doc
if ever I might need to use them again.

It seems to work safely for me so far....