Sets size of the buffer used for proxying.
The buffer size is equal to one memory page by default.
Depending on a platform, this is either 4K or 8K.
Defines whether to pass the error message obtained during
an authentication on the backend to the client.
Usually, if the authentication in nginx was successful,
backend can’t return an error, but if it nonetheless exists,
this means there is some problem inside.
In such cases the backend message can contain the information
that should not be shown to the client.
However responding with an error for the correct password
is a normal behavior of some POP3 servers.
For example, CommuniGatePro informs user about
overflow or other events by periodically outputting the
The directive should be enabled in this case.
Defines a timeout used after the proxying to the backend had started.
Enables or disables issuing of the
upon the connection to the SMTP backend.
XCLIENT command to work it is required to have
Postfix with the
which adds the
XCLIENT command is not used, the MTA will be unable
to write the client’s
to the log and apply various limitations based on this data.
xclient is enabled,
then upon a backend connection nginx first issues
XCLIENT PROTO=ESMTP HELO=client_hello ADDR=192.168.1.1 LOGIN=good_user NAME=[UNAVAILABLE]
If the client upon a connection to nginx issued the
XCLIENT command will pass
PROTO=SMTP will be passed.
The IP address of a client is specified in the
parameter, and since nginx does not use DNS to resolve the hostname,
NAME=[UNAVAILABLE] is specified.
xclient is disabled,
EHLO is issued upon the connection to the backend
if the client had passed it and the
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