Recently, addressing emails has become a mine field. I email my wife frequently, so I made her an email description name starting with a period. Always before, in the To field, I'd type a period, her name came up. I selected it and my emails went to her. Now, four other names come up because they have a period in them somewhere. Annoying but not serious. But, the horror is, sometimes, after I have carefully clicked on her name, Thunderbird quietly replaces it with a different address, most often the fourth name from the list. That guy has now gotten several private emails only my wife was supposed to see. I try to catch it, and have corrected several incidences, but it is easy to miss and another slipped through recently. On several of those switched address incidents I caught, I had been watching carefully to be sure it was her address I had selected - but Thunderbird switched addresses anyway. Note, this happens even when I am sending to only one address, unlike another posting about a similar problem when sending to multiple addresses. This has to be corrected before there is a real disaster! Is there a solution?