sent email does not appear in sent email list

go through correctly and are found in the Sent email directory.

without a "Shown Name" it only has an email address filled in.

folder and is easily searchable.

Bug report 15 Aug. 2026 The disappearing emails. It took me a while to find out what was going on. My friend said some of his Sent mail was nowhere to be found. After searching for it in a 'wrong' place it does not exist. Sending to the same recipient and again it just disappears. Simplifying the mail down to just address and the word "test", it still disappears. No combination of a Thunderbird search nor an Everything search finds anything. No return error message from this provider nor the recipients. This address is for the local electricity board, other mails to other departments go through correctly and are found in the Sent email directory. A careful inspection of the contact information shows this is the only department without a "Shown Name" it only has an email address filled in. Entering a Name for this contact solves the problem, it now shows up in the Sent folder and is easily searchable. I hope this explanation helps some one else with a 'Houdini' email.