Hello! […] > > directives smtp_client_buffer and smtp_greeting_delay > > still not documented. [...] Documentation added for smtp_client_buffer and smtp_greeting_delay: http://nginx.org/en/docs/mail/ngx_mail_smtp_module.html#smtp_client_buffer http://nginx.org/en/docs/mail/ngx_mail_smtp_module.html#smtp_greeting_delay Best regards, yar