A 554 email error is generally used when there is a generic delivery failure that another email error code doesn't directly define a problem for.
It appears the specific message of this error is:
"SMTP error from remote mail server after initial connection"
In this case, you will want to check the SMTP settings in your email client. Specifically, check to ensure that SMTP authentication is enabled, as some servers check for that and can reject emails if it is not enabled.
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