[rt-users] no alert for invalid mail addresses

[Martin Wheldon]

Hi,

You might want to checkout the perl module Regex::Common::Email::Address

Best Regards

Martin

On 2017-01-06 13:16, Petr Hanousek wrote:
> 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? :)
> Petr
> 
> 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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