Strange email codes in subject line

Hello,

Why do some emails come with letters that spell out no words in the subject line? Or there are nonsensical letters in between or after short phrases?

How can I figure out what they mean? I am on a shared computer and I don't open them but am not sure if they are meant for me or not.

Tkx,
Barb

check the sender email address if its a valid one.. can be only spam emails..