Dear Maintainer,
  I'm sorry for the complexity of the explanation.
  I hope the error can be reproductible.
  If it is a configuration error (which i doubt - cause i tried to
  delete/re-create the account), i hope the Claws-Mail team will improve
  the configuration interface. Below the report.

   * What led up to the situation?
   i configured 2 mailbox:
    - 1 on laposte.net [a]
    - 1 on runbox.com [b0]+ 3 identities[b1,b2,b3] (mailbox for smtp
     sending)
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
    I don't achieve have the mail sent in claws-mail.
    I tested 6 cases, with a config :
     1 - sending mail with [a] -> ok the mail goes in the a/Sent
        directory
     2 - sending mail with [b0] -> ko , the sent mail is not saved
     3 - sending mail with [b1] (same with [b2] or [b3]) -> ko, the mail
        is saved in a/Sent instead of b/Sent
     4 - i checked Advanced option for [b1]  "Save sent mail in .."
        b/Sent" which exists, and sending : ko the mail is not saved
     5 - i checked Advanced option for [b2]  "Save sent mail in .."
        b/SentAs/b2" which didn't exists, and sending : ko the mail is
        save in a/Sent
     6 - i checked Advanced option for [b3]  "Save sent
        mail in .." b/SentAs/b3" which exists, and sending : ko the mail
        is not saved

   * What outcome did you expect instead?
   I expected the mail to be saved in the Sent
   directory corresponding to the account, or in the more likely
   account for the case of smtp-only accounts...

This is something that looks like a general bug in Claws (if it still
occurs in current Claws version) and should be discussed in
users@lists.claws-mail.org mailing list or reported in the bugtracker:
https://www.thewildbeast.co.uk/claws-mail/bugzilla/index.cgi

On Thu, 23 Nov 2023 14:58:08 +0100 Marco Moock <mm@dorfdsl.de> wrote:

This is looking like user-error to me.

with regards

Paul