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A comment on The most useful under-used feature of email. Parent comment

Re:The most useful under-used feature of email by ses4j on Tuesday December 01, 2015 @05:15PM (#10659293)
Do you think they're intentionally blacklisting the +, or are they just writing sloppy validation/regexes that aren't up to the spec?
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Re:The most useful under-used feature of email by joezydeco on Tuesday December 01, 2015 @05:31PM (#10659389)
Hard to say.

I've encountered it on some very large and famous websites, so I'm thinking it's not always the fault of a bad regex.

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