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This is why you set up a email address at your own domain, and give any company asking for your email <company.domain>@<your.domain>

(And possibly complain publicly when unsubscribe links don't work)

Some email providers ignore '+' signs and periods in email addresses, but more and more companies have gotten wise to that.

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I've found an increasing number of sites use validation preventing the use of '+' in email addresses (which I used extensively when on Gmail). To get around this, I use a feature of Fastmail to give me something similar - <myname>@<company>.<my.domain>. By putting the unique part in the domain, it's less likely to be stopped by a fussy validator. Combine with some of their auto-filtering and I have an easy way to track who's abusing their ability to mail me, and to take action appropriately.

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