Anonymous messages are mysterious. You always want to guess who wrote the unsigned letter, why he chose to remain anonymous? This can be done in several ways.
If you cannot understand who is writing, read the letter carefully. Sometimes it happens that a person simply forgets to indicate his name or, deliberately not doing this, being afraid to sign the message, still leaves a clue for the addressee. It may be some phrase that he often uses in life, a hint of something that only you two know. Try to find something in the text that will bring you closer to the solution.
When you know a person's email address, you can try to find out who is writing to you using it. Many social networks provide a search for people by email addresses - use it. Do not forget about search engines, sometimes they help to find out information of this kind.
Think about what the sender's goals were when he wrote the unsigned message. Agree, friends, as a rule, do not need this, but for strangers - even more so. There are times when a person chooses the role of anonymous in order to communicate something that he has learned in a not entirely honest way, or when he is afraid that his message will disappoint the addressee.
Lovers are very fond of anonymous messages. It is difficult for them to confess their feelings, they try to inquire about the object of their passion, including by texting with him. Take a closer look at your surroundings: perhaps there are unlucky Romeos among your acquaintances. By the way, anonymity is to the taste not only of Romeo, but also of Othello. So, if you recently broke up with your partner, it makes sense to suspect that he is the author of the letters.
If you cannot understand who the author of the letter is, ask him himself (if, of course, he left contact details). In the case when this is impossible, you just have to rely on your own intuition. Become a detective. Just for a couple of minutes. If you don't know who wrote the message, at least make your brain work: training will never hurt it.