Spam coming from my email address

lately I get a lot of spam like this one, disguised as coming from my email address (how do they do that?..). Moving it to spam doesn’t seem to help, it still keeps coming. 15 now in the morning

170 Piece Stanley Tool Set - Shipment Pending.rtf (4.9 KB)

170 Piece Stanley Tool Set - Shipment Pending.txt (21.5 KB)

any suggestions?
thanks

Anyone can send e-mail “from” any address, just as you can write whatever you want for the return address on a paper envelope. Most likely these are getting through because SpamSieve is configured to always accept messages from your address. I recommend changing that as described here.

thank you!