esmtp             206 mail/ngx_mail.h     unsigned                esmtp:1;
esmtp             516 mail/ngx_mail_proxy_module.c                        ((s->esmtp || pcf->xclient) ? "EHLO " : "HELO "),
esmtp             583 mail/ngx_mail_proxy_module.c                        ((s->esmtp) ? "EHLO %V" CRLF : "HELO %V" CRLF),
esmtp             550 mail/ngx_mail_smtp_handler.c         s->esmtp = 1;