What are the common causes for SMTP error 535 5.7.3?

By: USER3442
29 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
What are the common causes for SMTP error 535 5.7.3?
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Common causes include incorrect username or password, using the wrong port for SMTP authentication (e.g., not using a secured port like 587 or 465), the sending application or service not supporting the required authentication method, or the account itself being locked or disabled by the email provider.
Answered on 29 Agustus 2025

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