dmarc user can't receive email because of encrypted storage

Hi all,

So recently google has been trying to send email to dmarc@domain.com on my server but I'm using encrypted storage and since the dmarc user has no password the email is being rejected with the error:

May  4 16:51:50 domain dovecot: lda(dmarc)<3326>: Error: sieve: msgid=10341808348719730099@google.com: failed to store into mailbox 'INBOX': generate_keypair(INBOX) failed: mail_crypt_require_encrypted_user_key set, cannot generate user keypair without password or key

How can I fix this, or at least read what the mail says? Would it be safe to just give dmarc user a strong password?