ngx_mail_pop3_module

Directives
     pop3_auth
     pop3_capabilities

Directives

syntax: pop3_auth method ...;
default:
pop3_auth plain;
context: mail, server

Sets permitted methods of authentication for POP3 clients.
Supported methods are:

plain
USER/PASS,
AUTH PLAIN,
AUTH LOGIN.
It is not possible to disable this methods.
apop
APOP.
In order for this method to work, the password must be stored unencrypted.
cram-md5
AUTH CRAM-MD5.
In order for this method to work, the password must be stored unencrypted.

syntax: pop3_capabilities extension ...;
default:
pop3_capabilities TOP USER UIDL;
context: mail, server

Allows to specify the
POP3 protocol
extensions list to be passed to the client upon
issuing the CAPA command.

Authentication methods specified in the pop3_auth and
(SASL extension) and
STLS directives,
are automatically added to this list if the
starttls directive is enabled.

It makes sense to specify extensions
supported by POP3 backends
to which clients are proxied (if this extensions are related to commands
used after the authentication, when nginx transparently proxies the client
connection to the backend).

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

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