Support option to allow longer email addresses

[AdriVanHoudt]

Hi,

Atm we use Joi 14 which uses isEmail to validate email addresses.
We use it like this: Joi.string().email({ errorLevel: 68 }).
As you can see we use the errorLevel to make the validation more relaxed, mainly for long email addresses.
Now the upgrade to a newer Joi version replaced isEmail with this module leaving us with no 'out of the box' option to migrate our email validation without breaking it.
I understand that this module tries to validate to spec as much as possible for our use case this strictness is just a bit too much (sadly :P).
The spec also states 4.5.3.1. Size Limits and Minimums [...] To the maximum extent possible, implementation techniques that impose no limits on the length of these objects should be used.
Would you consider an option to allow longer addresses and then exposing said option through Joi.email()?
I think it is mostly around this line https://github.com/hapijs/address/blob/master/lib/index.js#L98
If you want I can submit a PR for this.

[AdriVanHoudt]

@hueniverse friendly ping to get your opinion on this, would love to not have jump several major joi versions when 16 comes out :P

[hueniverse]

Closed by bc728f7

[AdriVanHoudt]

Thanks for this!

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