[Solved] Certbot renewal hook won’t finish [closed]

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The solution has been posted at https://github.com/certbot/certbot/issues/5424#issuecomment-372126909: restarting dovecot holds stderr open, this blocks python. Changing the script in the following way solved my problem:

#!/bin/sh
service dovecot restart 2>/dev/null

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solved Certbot renewal hook won’t finish [closed]