Hi, Has anyone of you observed problems with mail attachments in Sierra? Two days ago I installed Sierra and since then I've heard from mail recipients that they can't open attachments I sent them. This doesn't seem to be restricted to a specific file type, the problem occurred with .xlsx (small test file containing only one word) as well as with .zip files. I haven't tried other file types. The problem has occurred with recipients using Exchange in Windows, an Android tablet and a web mailer. In Thunderbird on Windows, however, the file could be opened successfully. I haven't seen it myself, but from what these users describe, they see the paper clip icon in the list of their mails, but in the mail itself there is no file to open. Mail is set to send attachments Windows-compatible and I'm also using the Anti Inline plug-in from Clive Galeni. Is this something that others have experienced as well? I've googled the problem, but I couldn't find anything.