LMTP error in newest Dovecot

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After upgrading from Dovecot 2.2.29.1 to 2.2.30.1, one of my users email account have this error in the log (I have masked the email address and user):

Code:

2017-06-05 17:23:20 Received from useame@host.name.tld U=user-removed P=local S=3314 id=xxxxx@www.domain.tld T="subject-removed"
2017-06-05 17:23:20 email@address.tld R=virtual_user T=dovecot_lmtp_udp defer (-44): LMTP error after RCPT TO:<email@address.tld>: 451 4.3.0 <email@address.tld> Inteal error occurred. Refer to server log for more information.
The email is sent from a contact form on the site, and the email address is local on the same server. When it have this error, it just stays in email queue, however as soon as I manually hit "Retry", then it works and is sent.

So far this only happen to this one user. I have not seen it on any other email addresses. Have anybody else seen this happen? I don't find anything else in the logs.

By the way I am running the newest exim.conf and dovecot.conf.

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