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Anyone with half a clue that is doing heavy marketing via email, knows to strip the stuff after the +. BTW, the + is part of the email specification, and technically any email server not supporting it is broken.

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Although '+' is an acceptable symbol, there's actually nothing in the RFCs that mandates sub-addressing behaviour. The closest you'll get is RFC5233 that defines it for the Sieve filtering language. So although very common, sub-address behaviour is not a standards requirement and should not be presumed.

By "heavy marketing" I presume you mean spammers. If not, be warned, sub-address stripping will mean nondelivery in some cases and could trigger blacklisting via honeypots.

Additionally, either through malice or mistake many email forms disallow + signs entirely.

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