[imp] Trouble with email addresses containing empty domain labels

[Jan Schneider]

Zitat von Jens Wahnes <wahnes at uni-koeln.de>:

> Hi,
>
> with current stable version of Imp (6.2.17) and Horde_Smtp (1.9.4),  
> we are seeing problems with emails that are to be sent to addresses  
> that appear to be invalid, as they contain two adjacent dots and  
> thus an empty "label" (at least that's what I would call this in DNS  
> vocabulary).  To make things clearer, consider, for example, an  
> address such as johndoe at example..com
>
> When one tries to send an email to an address like that, at a  
> certain point in processing that email, some Horde component seems  
> to drop the domain part of the address completely. So in the example  
> of "johndoe at example..com", it will try to send an email to just  
> "johndoe" without any domain. Interestingly enough, the entry in the  
> imp_sentmail table contains the full (wrong) address. On the other  
> hand, the "To" header of the email, as saved in the "Sent" folder on  
> the IMAP server, does not contain the full address, but only the  
> localpart. Of course, the recipient's address given in the SMTP  
> dialogue is lacking the domain as well.
>
> So after doing some tests, I'm still unsure if Imp or Horde_Smtp or  
> some other package is to be blamed.  Could someone help clarify?
>
> Of course, there is also the question of how to best deal with this.  
> In an ideal world, I'd say that Horde_Smtp should be able to deal  
> with these kind of email addresses but Imp should never generate  
> them. IMHO, users trying to send an email to an address with a typo  
> like this (two dots instead of one dot) should receive an error  
> message and the message should not be sent until they revised the  
> email address.
>
>
> Jens

I was able to track this down to Horde_Idna. The error will be catched  
in Horde_Idna 1.1.0 and displayed smarter in IMP 6.2.18.

-- 
Jan Schneider
The Horde Project
https://www.horde.org/