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[stop50]

Thats what a lot of people do with their own domains.

[harshitjain007 → stop50]

But how does that bind one email id to a single sender?

[stop50 → harshitjain007]

Postfix redirects the emails to my main account and sieve orders them into folders depending on the alias username. I only use one alias for one account. So when a thirdparty gets that alias i change the alias in database and the account and it gets mapped to my spamfilter.