ngx_mail_smtp_module

Directives
     smtp_auth
     smtp_capabilities

Directives

syntax: smtp_auth method ...;
default:
smtp_auth login plain;
context: mail, server

Sets permitted methods of
SASL authentication
for SMTP 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: smtp_capabilities extension ...;
default:

context: mail, server

Allows to specify the SMTP protocol extensions list
to be passed to the client in the response to the
EHLO command.
Authentication methods specified in the smtp_auth directive
are automatically added to this list.

It makes sense to specify extensions
supported by MTA
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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