SMTP Authentication Fail with Fastmail Configuration

TLDR rinndoge shared an SMTPFatalError he encountered, questioning if the configured SMTP settings with fastmail might be causing the problem.

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rinndoge
Sun, 09 Apr 2023 18:00:56 UTC

https://media.discordapp.net/attachments/1093371392919076955/1093706807219855470/image.png?width=1440&height=217 Net::SMTPFatalError: 551 5.7.1 Not authorised to send from this header address

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rinndoge
Mon, 10 Apr 2023 00:17:05 UTC

#SMTP domain key is set up for HELO checking SMTP_DOMAIN=smtp.fastmail.com # Set the value to "mailhog" if using docker-compose for development environments, # Set the value as "localhost" or your SMTP address in other environments

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rinndoge
Mon, 10 Apr 2023 00:17:08 UTC

Could this cause the issue?