this post was submitted on 04 Nov 2023
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DeGoogle Yourself
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The reason is that + is specified in the RFC as being for email aliases, so many systems ban it because they don't want you to be able to track who they got your email from. A hyphen, on the other hand, is a normal character.
You're no RFC compliant doing what you're doing, but the advertiser won't catch on immediately because of it.
I don’t believe there’s any RFC that says I can’t or shouldn’t do what I’m doing. The only RFC concerning subaddressing I can find is RFC 5233 (and the one it obsoletes). That one only concerns sieve filtering, which I’m not doing, and it specifies that any character can be configured as the separator character. The three examples it gives are “+”, “#”, and “--“.