Support additional characters in routes

[AndrewBucklin]

Route validation doesn't adhere to RFC. I noticed this when trying to add a route with an underscore in the email address. To fix it, I modified this file locally (line 37) and added the underscore:
https://github.com/postalhq/postal/blob/master/app/models/route.rb

But as per RFC, there are many other special characters allowed in the "local part" which this validation will incorrectly return as invaludl. Here's an article which goes into detail: https://help.returnpath.com/hc/en-us/articles/220560587-What-are-the-rules-for-email-address-syntax-

[willpower232]

Are you able to make a PR with the required changes in?

[plabbett]

Hello! I don't really know ruby well (or regex) but could you replace that line with something like this: URI::MailTo::EMAIL_REGEXP?

i.e.,

validates :name, :presence => true, :format => /\A(([a-z0-9\-\.]*)|(\*)|(__returnpath__))\z/

to

validates :name, :presence => true, :format => URI::MailTo::EMAIL_REGEXP

Credit

[plabbett]

I realize that's probably only the user section - these might be more appropriate

/\A([a-z0-9]+[\w|\-|\.|\+]*/i according to rubygarage.org

/\A([\w+\-].?)/i according to emailregex.com

[catphish]

This isn't a bug per-se. Just because special characters are allowed in email addresses doesn't mean a mailbox needs to support those characters. With that said, there's clearly a use case, and I see no reason not to support a reasonable variety of characters. I would suggest that . _ and - would be sufficient, but if anyone thinks any other characters are likely to be useful, I will happily add them.

[AndrewBucklin]

I think + should also be supported since many people use the “plus addressing” feature I systems like Gmail and Office 365.

[willpower232]

seeing this has reminded me of #480 (comment) so there be similar use cases