On 23Jan2018 03:28, Ionel Mugurel Ciobîcă <i.m.ciob...@upcmail.nl> wrote:
On 23-01-2018, at 13h 01'28", Cameron Simpson wrote about "Re: hide identical mails 
within the same thread"
On 22Jan2018 15:48, Ben Boeckel <maths...@gmail.com> wrote:
>On Mon, Jan 22, 2018 at 20:49:13 +0100, Ionel Mugurel Ciobîcă wrote:
>>That would still require to have identical e-mails in more than one
>>mailbox...
>
>It happens with gmail when an email has more than one label.

And to me locally when I crossfile email and/or when I get a personal CC of
a list email (lands in my personal inbox and the list folder).


procmail can help you here. I never get duplicate mails... Add this up
on your .procmailrc file:

| # avoid cross-post (duplicate mails)
|               :0 Wh: msgid.lock
|               | formail -D 32768 msgid.cache

You misunderstand. I _expect_ these duplicates. I could strip them, but I don't. I'm just describing normal circumstances in which this can and does occur.

Regarding procmail, I experimented with the recipe you describe but decided it wasn't for me. And I dropped procmail some years ago and wrote my own filer.

Cheers,
Cameron Simpson <c...@cskk.id.au> (formerly c...@zip.com.au)

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