Email to user failed: Expected response code 250 but got code 421 Service not available, closing transmission channel. Swiftmailer.

[MaximilianKohler]

I don't see any other threads covering this error.

It looks like something went wrong during the user registration, but I looked up the email and their user state is "valid".

Swift_TransportException: Email to [email protected] from [email protected] failed: Expected response code 250 but got code "421", with message "421 Service not available, closing transmission channel. " src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459...
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Email to user failed: Expected response code 250 but got code 421 Service not available, closing transmission channel. Swiftmailer.

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