They have periodic stuff like this on reaching a certain number of avast downloads. The last big one was at the end of last year though. Usually this has been a 1 year Pro license, etc.
However, we certainly need more information.
@ alfputra
If you deleted the email, first check your deleted emails folder and see if it is there, second if it isn't, depending on your email program (?) there may well be a tool to recover deleted emails. Google such a tool for your email program.