Rating:
## Solution
Viewing the [eml](https://gitlab.com/malcrypt/ctf-archive/-/blob/master/2021/tenable/misc/grandma/provided/tmp.eml) file, the subject line has curly braces in it at the same locations as a flag. It becomes apparent that the subject line is Morse Code where `FWD:` is dot and `RE:` is dash. The subject line thus translates to:
```
..-. .-.. .- --.{.. ..--.- -- .. ... ... ..--.- .- --- .-..}
```
Using an online Morse Code decoder, the flag is recovered.
## Flag
**flag{i_miss_aol}**
