Hello,

Looking at group mail splitting I found several room of improvement:

- make sure to use an email only once, when “to-address” and “to-list”
  are equal the same mail is present two times in “nnmail-split-fancy”

- use “regexp-opt” for to-address, to-list and extra-aliases

- as ding mailing list does not define “List-Post” headers, we shoud take
  the “to-address” and “to-list” mails, replace the “@” with “.” and add
  “List-ID” to “nnmail-split-abbrev-alist”

Any comment welcome.

Regards.

-- 
Daniel Dehennin
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