=encoding utf-8 =head1 NAME ngx_mail_smtp_module - Module ngx_mail_smtp_module =head1 Directives =head2 smtp_auth B smtp_auth I> ...> B I B I B I Sets permitted methods of L for SMTP clients. Supported methods are: =over =item C L =item C L =item C L. In order for this method to work, the password must be stored unencrypted. =item C Authentication is not required. =back =head2 smtp_capabilities B smtp_capabilities I> ...> B I B I Sets the SMTP protocol extensions list that is passed to the client in response to the C command. Authentication methods specified in the L directive are automatically added to this list. It makes sense to specify the extensions supported by the MTA to which the clients are proxied (if these 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 L.