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+To convert the PEM-encoded public keys from this directory to TXT
+records, run
+
+ $ SELECTOR="8f00fb94ec6c37aacb48bd43e073f9b7"
+ $ DOMAIN="fripost.org"
+ $ printf "%s._domainkey.%s IN TXT (\n" "$SELECTOR" "$DOMAIN"; \
+ { printf "v=DKIM1; k=rsa; t=s; s=email; p=";
+ openssl pkey -pubin -in "./certs/dkim/$SELECTOR:$DOMAIN.pub" -outform DER | base64 -w0
+ } | fold -w64 | sed 's/.*/ "&"/; $s/$/ )\n/'
+
+Remove the "t=s" tag if subdomaining or third-party signature (hosted
+domain) is required, cf. RFC 6376 sec. 3.6.1.