About several hours ago I started getting A LOT of spam e-mails, 6 per minute on average. I have no idea what went wrong. This is the e-mail address that I'm using for years and I was very careful in regard where I was typing it. I know a lot about computers, software and stuff (started working as a programmer recently), and I'm saying this just to throw out recklessness from the equation. It's my main e-mail, not gmail or yahoo or some other, it's the e-mail that has been given to me from my internet provider ages ago, and it has been used for serious correspondence only.
Almost all e-mails are the same, I'll take a picture of one and post it to you guys (my e-mail address is crossed out on every place it had been stated). And it's stated there that I've been actually sending some meaningless e-mails from my address to random people and that they were undeliverable.
I have no experience in this and have no idea how this has happened. Can this somehow be fixed, or can anyone at least explain to me what is going on?
Thank you very much in advance.