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Re:The Correct Way to Validate Email Addresses by mayneack on Wednesday September 07, 2016 @09:57PM (#12449642)
BestBuy allowed me to sign up with a trailing "[email protected]", but their unsubscribe interface rejects it as invalid, so I can't unsubscribe from their promos. I just filter/mark as spam and move on.
Re:The Correct Way to Validate Email Addresses by Benjamin_Dobell on Wednesday September 07, 2016 @10:52PM (#12449925)
I've seen this several times as well. If it's a referral link to unsubscribe and is meant to include your email, double check it's okay. If your plus is missing insert "%2B" where it should be.

It's less common, but some websites ask you to type your email address once they realise they can't find you on record. If the "+" doesn't work in that field (server side rejected), then you can try %2B there as well.