[Kde-pim] Restrict auto-complete / check domains of email addresses

[Stephan Diestelhorst]

Hi all,
  long time user / reader here.  I just did a very stupid thing:
sending an email with personal stuff to a public mailing list, because
the auto-completion completed the real recipient "John Doe
<john.doe at example.com>" with "John Doe via publi-ML
<ml at example-ml.com>", as the first option and I did not pay not enough
attention :-/  My question is, what technical counter-measures I can
take to prevent this.  I would appreciate comments from devs on what
would make sense to implement:

(1) have a KMail / Akonadi plugin that checks for cross-domain emails
/ unusual combinations of recipients, recipients and subjects, vs a
black-list / whitelist (that might also help when there are
john.doe at work.com vs john.doe at gmail.com and I am sending from
me at work.com); this might be coupled with the identities, and maybe
have a public and a private / internal identity (which I do BTW)

(2) use an SMTP proxy that does (1) and send mails through localhost

(3) be more selective about the auto-completion ("Sources from data")
to exclude specific addresses / specify a regexp for sort order

Any pointer for related work would be great, I know that Thunderbird
has some extensions for that.  I can, and am happy to, code something
here.  In order to make this most applicable, I would be glad for
pointers from folks.

Thanks,
  Stephan
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