[kmail2] [Bug 428401] New: When composing an email, sometimes TO and CC recipients are moved to BCC

[German Pulido]

https://bugs.kde.org/show_bug.cgi?id=428401

            Bug ID: 428401
           Summary: When composing an email, sometimes TO and CC
                    recipients are moved to BCC
           Product: kmail2
           Version: 5.15.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: gpulido at redhat.com
  Target Milestone: ---

SUMMARY
When I am composing an e-mail, or replying to an existing one, the To: and CC:
fields are converted to BCC:. This is very annoying and it makes kmail kind of
unusable.

STEPS TO REPRODUCE
1. Create a new e-mail in kmail (or kontact)
2. Type an address in the To: field
3. Type a second address in the second address field. Change it from To: to CC:
4. Type a subject and an email contents
5. Send the email

OBSERVED RESULT
The email gets sent, but the recipient addresses are randomly (IMO) moved into
BCC. It does not seem to depend on the addresses I use, I have done several
tests with the same two addresses and sometimes one of them is converted to
BCC, sometimes both.

EXPECTED RESULT
The To: and CC: recipients are kept and the email is sent correctly, nothing is
put into BCC (unless I manually include bcc recipients).

SOFTWARE/OS VERSIONS
Fedora 33, KDE 5, kmail 5.15.1

ADDITIONAL INFORMATION
I'm testing sending email from my corporate Gmail address, which works
perfectly using Evolution (so I do not think the issue is on the mail server
side). If any test/logs/files are needed, please let me know.

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