nginx

Module ngx_mail_imap_module


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Directives
     imap_auth
     imap_capabilities
     imap_client_buffer

Directives

syntax: imap_auth method ...;
default:
imap_auth plain;
context: mail, server

Sets permitted methods of authentication for IMAP clients. Supported methods are:

login
AUTH=LOGIN
plain
AUTH=PLAIN
cram-md5
AUTH=CRAM-MD5. In order for this method to work, the password must be stored unencrypted.

syntax: imap_capabilities extension ...;
default:
imap_capabilities IMAP4 IMAP4rev1 UIDPLUS;
context: mail, server

Sets the IMAP protocol extensions list that is passed to the client in response to the CAPABILITY command. The authentication methods specified in the imap_auth and STARTTLS directives are automatically added to this list if the starttls directive is enabled.

It makes sense to specify the extensions supported by the IMAP backends to which the clients are proxied (if these extensions are related to commands used after the authentication, when nginx transparently proxies a client connection to the backend).

The current list of standardized extensions is published at www.iana.org.

syntax: imap_client_buffer size;
default:
imap_client_buffer 4k|8k;
context: mail, server

Sets the IMAP commands read buffer size. By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform.