Mastering Nginx

Directive Reference

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Directive Explanation Context/Default

pop3_capabilities Indicates which POP3 capabilities

are supported by the backend

server.

Valid contexts: mail,

server

Default value: TOP

USER UIDL

port_in_redirect Determines whether or not

the port will be specified in a

redirect method issued by

NGINX.

Valid contexts: http,

server, location

Default value: on

postpone_output Specifies the minimum size of data

for NGINX to send to the client. If

possible, no data will be sent until

this value is reached.

Valid contexts: http,

server, location

Default value: 1460

protocol Indicates which protocol is

supported by this mail server

context. It may be one of imap,

pop3, or smtp.

Valid context: server

Default value: -

proxy Enables or disables mail proxying. Valid context: server

Default value: -

proxy_bind Specifies which address should be

used for outgoing connections to a

proxied server.

Valid contexts: http,

server, location

Default value: -

proxy_buffer Allows setting the size of the

buffer used for the mail proxy

connection beyond the default of

one page.

Valid contexts: mail,

server

Default value: 4k|8k

(platform dependent)

proxy_buffer_size The size of the buffer used for

the first part of the response from

the upstream server, in which the

response headers are found.

Valid contexts: http,

server, location

Default value: 4k|8k

(platform dependent)

proxy_buffering Activates buffering of proxied

content; when switched off,

responses are sent synchronously

to the client as soon as they are

received.

Valid contexts: http,

server, location

Default value: on