What email providers allow + in email address?

Question

Possible Duplicate:
How to validate an email address in PHP

I'm working on my email address validator.

So I've been searching a while and noticed that some emails allows "+" in the email like: hello+guys@email.com

Hotmail doesn't allow a + and neither do yahoo. Do you guys know which ones doesn't allow it? And I also wonder, maybe there are some old hotmail/yahoo/etc accounts that actually contains the + character?

What do you think? I dont want my script to deny emails with a + if they do exists...

[How to and how **not to** validate an email address in PHP](http://stackoverflow.com/questions/12026842/how-to-validate-an-email-address-in-php/12026863#12026863) — PeeHaa, Nov 27 '12 at 19:37
http://en.wikipedia.org/wiki/Email_address#Valid_email_addresses — MacMac, Nov 27 '12 at 19:37
[Using regular expressions to match email addresses](http://www.regular-expressions.info/email.html) — Martin Ender, Nov 27 '12 at 19:39
@m.buettner stop that please. Those regex "solutions" will fail — PeeHaa, Nov 27 '12 at 19:40
@PeeHaa if you had read the link I posted, you would know that the conclusion is exactly the same. And that was my point. — Martin Ender, Nov 27 '12 at 20:01
Kilise, kindly do not remove the "Possible Duplicate:" link when closed by the community as a duplicate — , Nov 27 '12 at 20:06
Some do, some don't. You can't get any more exact than that. — Andy Lester, Nov 27 '12 at 20:53

score 3 · Accepted Answer · answered Nov 27 '12 at 19:39

3

There is a list of valid email characters under the syntax on http://en.wikipedia.org/wiki/Email_address and without going to each mail client and testing each character and email there is no way to tell who allows what.

answered Nov 27 '12 at 19:39

Samuel Cook

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score 0 · Answer 2 · answered Nov 27 '12 at 19:55

0

Reason yahoo, hotmail would not allow it as it is also used as a user name and can lead to unexpected bugs. I do not think that many people out there are using + in there email, it is not the reason to limit your user base.

answered Nov 27 '12 at 19:55

E_p

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What email providers allow + in email address?

2 Answers2