TLDR rinndoge shared an SMTPFatalError he encountered, questioning if the configured SMTP settings with fastmail might be causing the problem.
Net::SMTPFatalError: 551 5.7.1 Not authorised to send from this header address
#SMTP domain key is set up for HELO checking
# Set the value to "mailhog" if using docker-compose for development environments,
# Set the value as "localhost" or your SMTP address in other environments
Could this cause the issue?
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