Hello Jeffrey,
thank you, I'll try to implement it here. Wonder if someone has done it
before or if there is any plugin for this? Or (the best way) if some
developer encodes it to some future release of RT? :)

On 5.1.2017 21:51, Jeffrey Pilant wrote:
> Check out
>       http://www.regular-expressions.info/email.html
> It indicates the 'most' official regex is:
> \A(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*
>  |  "(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]
>       |  \\[\x01-\x09\x0b\x0c\x0e-\x7f])*")
> @ (?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
>   |  \[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}
>        (?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:
>           (?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]
>           |  \\[\x01-\x09\x0b\x0c\x0e-\x7f])+)
>      \])\z
> Yeah.  Quite a mouthful.  This is because there are quite a few ways to 
> express email addresses.  And even this is not foolproof.
> The same page also has other simpler regex expressions that work a fair 
> amount of the time, but are less complicated, like:
> \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}\b
> The page claims it is 99% effective.
> That, however, does not solve your problem.  Just because it is formulated 
> correctly does not mean it is a valid address.
> The usual solution is to whitelist the addresses and do a lookup.  Any 
> address not found gets added tentatively, but flagged for testing.  You can 
> also at this time prompt for acceptance vs. going back to an edit screen.  
> This does require you maintain a list of valid email addresses somewhere.  
> The user list is a likely place, but if you are sending emails to people who 
> are not users, then that fails.
> /jeff
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   Petr Hanousek                   e-mail: petr.hanou...@cesnet.cz
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