I agreed to a recent update and since then my sent messages have disappeared apart from some very old ones. THey continue to disappear after I have sent a message.
Hello Sarah,
was it the update of eM Client or you updated Windows?
We can continue in troubleshooting if you please provide your version of eM Client and what type of account do you use.
What I can recommend to try viewing the webmail and see if messages disappeared from there too.