Module ngx_mail_smtp_module

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2023-12-01

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 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.