Typo

README.md

 Known Issues
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-- Due to the way PostSRRSd is integrated with Postfix, sender addresses
+- Due to the way PostSRSd is integrated with Postfix, sender addresses
   will always be rewritten even if the mail is not forwarded at all. This
   is because the canonical maps are read by the cleanup daemon, which
   processes mails at the very beginning before any routing decision is made.