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I also reached out to them on Twitter but they directed me to this form. I followed up with them on Twitter with what happened in this screenshot but they are now ignoring me.

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[-] dan@upvote.au 28 points 11 months ago* (last edited 11 months ago)

You can use symbols like [ ] . { } ~ = | $ in the local-part (bit before the @) of email addresses. They're all perfectly valid but a lot of email validators reject them. You can even use spaces as long as it's using quotation marks, like

"hello world"@example.com

A lot of validators try to do too much. Just strip spaces from the start and end, look for an @ and a ., and send an email to it to validate it. You don't really care if the email address looks valid; you just care whether it can actually receive email, so that's what you should be testing for.

[-] itsralC@lemm.ee 18 points 11 months ago

Not even a dot: TLDs are valid email domains. joe@google is a correct address.

[-] RubberElectrons@lemmy.world 3 points 11 months ago

Mmm... That doesn't seem right, it's usually gotta be fully expanded to at least a particular A record/MX.

How would you tie the tld itself to an MX?

[-] TwitchingCheese@lemmy.world 15 points 11 months ago

TLD is just another DNS layer, try an SOA or NS lookup for "com." those are obviously hosted somewhere. Hell the "." at the end is even another layer with the root nameservers. You'd probably trip up a bunch of systems that filter on common convention rather than the actual RFC, but you could do it.

[-] RubberElectrons@lemmy.world 2 points 11 months ago

How the hell were the original rfc designers so creative as to result in such a flexible system?? It's gets crazier the more you look at it.

[-] PoolloverNathan@programming.dev 5 points 11 months ago

It makes the system as a whole simpler. Your computer only needs to remember one root DNS server (although most computers allow setting 4 for redundancy) as opposed to one DNS server for each TLD, and it also makes adding TLDs easier.

[-] darkpanda@lemmy.world 12 points 11 months ago

To this point, there’s a website dedicated to the subject. Some of the regexes get pretty wild…

https://emailregex.com/

[-] tomi000@lemmy.world 4 points 11 months ago

Yea but most of the time its more important to block code injection than to have the last promille of valid mail adresses be accepted.

[-] dan@upvote.au 5 points 11 months ago

You're not going to get code injection via an email address field. Just make sure you're using prepared statements (if you're using a SQL database) and that you properly escape the email if you output it to a HTML page.

[-] ChaoticNeutralCzech@feddit.de 3 points 11 months ago

I think emailregex.com offers best of both worlds.

this post was submitted on 15 Dec 2023
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