1048194 - Unwanted mass mail instead of single recipient address

Status: RESOLVED DUPLICATE of bug 1008718

(Thunderbird :: Untriaged, defect)

Description

[Carsten Logemann]

I created a Mail with one single recipient. When sending the mail, the mail was sent to a list of of recipient address. Every address as "TO" not "CC"/"BCC". This recipient replacement was not visible before sending but the mail is saved with this replacement and can be analyzed. 
Ironically the wanted recipient was not in the list of recipients. Because of the privacy problems I think this is a critical bug.

On the first view the list of recipients was confusing to me. I started to search in the address book of Thunderbird and found the list of the 40 recipients. This was an imported list of my Mac OS X system address book. This list had an important characteristic: It's title was empty! I believe there was another bug on my mac which created this list with an empty title. But there is the bug in Thunderbird which uses this buggy list as mass recipient list instead of the chosen address.

Because of the heavy impact on my personal communication I directly removed the copy of the system address book from my Thunderbird address book. Deleting from my system address book was possible when I gave it a name.
I know that is very hard to reproduce even for me since I did this deletions.
I had one idea why this was happened now to me. Mostly I write mails with known recipients. The last one wasn't in my address book because it was new.

I think it's useful to create a test system user and dummy addresses. But I don't know how to manually create a list in the system address book without a title. Also in Thunderbird itself its not possible. But maybe somebody can create this for coding tests.