[Users] Filter->Condition: test for missing Date header?

[wwp]

Hello Pierre,


On Mon, 24 Mar 2025 19:54:27 -0400 Pierre Fortin via Users <users at lists.claws-mail.org> wrote:

> On Tue, 25 Mar 2025 00:40:02 +0100 wwp wrote:
> 
> >On Mon, 24 Mar 2025 19:22:30 -0400 Pierre Fortin via Users <users at lists.claws-mail.org> wrote:
> >
> >[snip]  
> >> Didn't have to wait long for one of these messages.
> >> However, this rule didn't trigger; so I opened the Filter Log, cleared
> >> it, and manually filtered which gave:
> >> [2025-03-24 19:08:36] filtering message (manually)
> >>                        message file: /home/pfortin/Mail.pfortin/inbox/72296
> >>                        Date: (null)
> >>                        From: 楽天証券からのお知らせ  <supportcontact at glaq.com>
> >>                        To: pfortin at pfortin.com
> >>                        Subject: 【楽天証券】株式取引手数料最大50%OFF！期間限定スペシャルオファー
> >> [2025-03-24 19:08:36] processing rule 'No Date' [ ~header "Date" regexpcase "." color 2 ]    
> >> > rule is not account-based      
> >> [2025-03-24 19:08:36] checking if message matches [ ~header "Date" regexpcase "." ]    
> >> > message does not match      
> >> 
> >> Also tried: header "Date" regexpcase "."  (contains)
> >> 
> >> So it appears there's no way to check for a missing header...
> >> 
> >> I suspect the "juice ain't worth the squeeze" to add Header "is missing" as a 3rd choice to "contains"/"doesn't contain".    
> >
> >I also thought of: ~headers_part regexp "^Date: ", but it's maybe too
> >late this evening for me to think clearly :-/.  
> 
> Clearly enough!!  :)
> 
> Looks like a hidden feature as I couldn't find a way to set this up with
> the GUI; so I edited the rule directly and success!
> 
> [2025-03-24 19:50:23] filtering message (manually)
[snip[
> > message matches  
> 
> THANKS!!!

You're very welcome, Pierre.

Not at all a hidden feature:

1. /Configuration/Filtering...
2. Click the Define... button to the right of Condition

3. (change the match criteria first)
Match criteria: [Phrase]   in [headers part]
Headers part [doesn't contain] [^Date: ]
[x] Use regexp

4. Click the Add button
5. end up with:
Condition [~headers_part regexpcase "^Date: "]

I guess the 'Phrase' match criteria is not that obvious, it's often the
last resort and may possibly be a performance penalty (when used to
parse email body for instance).


Regards,

-- 
wwp
https://useplaintext.email/