Create a habit of writing semantic, well structured file names with timestamps. Example: instead of “api testing.xlsx” write “Service XYZ API EndPoint Testing (2017-05-03).xlsx”.
Muster out a bit of thought for your email titles as well. Spend a few seconds thinking about how to best describe the problem in a short sentence. Instead of “Server maintenance” try “Server out of disk space, scheduled maintenance on Sunday afternoon”.
Spending a bit of time and effort in naming things accurately makes life easier for everyone involved. And as a bonus, it looks just lovely.