SMTP Error 502 - Command Not Implemented

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What This Error Means

SMTP error 502 indicates the server knows the command but doesn't support it:

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extension_off
Unsupported Extension
Your mail server is using an SMTP extension that the recipient's server doesn't support.
history
Legacy Server
The receiving server is running older software with limited command support.
admin_panel_settings
Disabled Feature
The feature has been intentionally disabled by the server administrator.

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Configure your mail server to not require optional SMTP extensions when connecting to this server.

Ensure your mail server is using standard SMTP commands that are universally supported.

Contact your mail server administrator to adjust SMTP settings for compatibility.

502 5.5.1 Command not implemented
502 VRFY command is disabled
502 Command not supported