UiPath errors / Auth
535: 5.7.3 Authentication unsuccessful
Cause
UiPath.Mail.Activities above 1.9.5 changed SMTP password transmission to SecureString, rejected by mail servers that do not support secure auth on the configured port/TLS.
Fix
In Send SMTP Mail Message, try port 587 with SecureConnection 'Auto', or port 25 with 'None'. If using a credential asset, pass the plain-text password. Downgrade UiPath.Mail.Activities to 1.9.5 as a stable workaround, or upgrade to 1.12.2+. Ensure the mail server (Exchange/O365) allows Basic Auth or App Passwords.
Part of the Automation Error Index — UiPath errors: browse all.
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