Symfony Switftmailer Mail is not sent

With the following command a test mail can be sent with Swiftmailer. If the email does not arrive, the Switftmailer parameters are inconfig/packages/swiftmailer.yaml probably wrong:

php bin/console swiftmailer:email:send --help

Since the email is sent with a queue, should nevertheless be Error_log be examined under var/log/, in it found with me the reason for my shipping problem:

app.ERROR: Exception occurred while flushing email queue: Expected response code 250 but got code "554", with message "554 Message rejected: 
Email address is not verified. The following identities failed the check in region EU-WEST-1: email1, email2


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