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Authentication
Basic Auth Option:
SASL Auth >yes
>no
Enable SASL authentication in the SMTP server. This option is the basis of below other options.
Extended Auth:
Same Domain Auth >yes
>no
This option is the pre-request of RCPT-TO Auth Check option,DATA Auth Check option.

RCPT-TO Auth Check >yes
>no
If both this and Same Domain Auth options enabled, the reciever is from the same domain as the sender, auth required.

DATA Auth Check >yes
>no
If both this and Same Domain Auth options enabled, and any reciever is from the same domain as the sender, auth required.

Address Compare Policy >no_macth
>exact_macth
>blur_macth
This option require SASL Auth option enabled.
This option will be checked when RCPT-TO Auth Check option or DATA Auth Check option enabled.
Other Extended Auth:
Any Session Auth >yes
>no
If any session needs sasl-auth.

Local Reciever Existence >yes
>no
If this option enabled, but the reciever dose not exist, error response will return.