Mail-receiver log errors after letsencrypt update

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You were right, there are other log entries in the output, but the output itself is garbled:

./launcher logs mail-receiver output begins with a <HEAD>:

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)
Operating environment:
HOSTNAME=discourse-mail-receiver
LANGUAGE=en_US.UTF-8
MAIL_DOMAIN=...
...
...
Setting smtpd_tls_security_level to 'may'
postfix/postfix-script: warning: symlink leaves directory: /etc/postfix/./makedefs.out

followed by a single line of log entries, and ending with the <HEAD> repeated six more times:

<HEAD>
Single line of log entries without line breaks..............................................................................................................................................................................................
<HEAD>
<HEAD>
<HEAD>
<HEAD>
<HEAD>
<HEAD>

I was only looking at the end of the output, and there was always seemingly just the <HEAD> without any other entries.

Definitely something wrong with the rendering of the log via ./launcher logs mail-receiver.