Sets the size of the buffer used for proxying. By default, the buffer size is equal to one memory page. Depending on a platform, it is either 4K or 8K.
Indicates whether to pass the error message obtained during the authentication on the backend to the client.
Usually, if the authentication in nginx is a success, the backend cannot return an error. If it nevertheless returns an error, it means some internal error has occurred. In such case the backend message can contain information that should not be shown to the client. However, responding with an error for the correct password is a normal behavior for some POP3 servers. For example, CommuniGatePro informs a user about mailbox overflow or other events by periodically outputting the authentication error. The directive should be enabled in this case.
Defines a timeout used after the proxying to the backend had started.
Enables or disables the passing of the XCLIENT command with client parameters when connecting to the SMTP backend.
If the name
by the client IP address points to the same address,
it is passed in the