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Postfix with smtpd_forbid_bare_newline (default hardening since 3.9, after SMTP smuggling) rejects the message with "521 5.5.2 Error: bare <LF> received". RFC 5321 requires CRLF. The python sender is unaffected (smtplib already emits CRLF). fix https://github.com/acmesh-official/acme.sh/issues/7104