SMTP error 542 occurs when the recipient mail server rejects the email. This error code means a bad connection to the recipient's email server. However, this specific error code has many hidden reasons for the email message to fail.
Some of the most typical issues are:
Troubleshooting this error is tricky since the error code can hide various underlying issues with the email communication and system. Therefore moving down from the most common problems can help narrow the issue swiftly.
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