550 Access denied - Invalid HELO name (See RFC5321


Mar 18, 2014
cPanel Access Level
Root Administrator

I'm not a regular forum user but this time I had no other option. I'm facing this problem since I migrate from shared hosting to a VPS with WHM / Cpanel and sometimes, just in SOME HOSTS, when i send an email, i get this error from from my own VPS, by "Mail delivery System"

  [email protected]
    SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=14077:
    host vps46790.ovh.net []: 550 Access denied - Invalid HELO name (See RFC2821

------ This is a copy of the message, including all the headers. ------

Return-path: <[email protected]>
Received: from av3-84-90-82-114.netvisao.pt ([]:50023 helo=AsusX52J)
	by vps46048 with esmtpa (Exim 4.82)
	(envelope-from <[email protected]>)
	id 1WPu2I-0003Cj-7y
	for [email protected]; Tue, 18 Mar 2014 13:26:30 +0000
From: =?iso-8859-1?Q?Gon=E7alo_Cabral?= <[email protected]>
To: <[email protected]>
Subject: teste
Date: Tue, 18 Mar 2014 13:27:07 -0000
Message-ID: <[email protected]>
MIME-Version: 1.0
Content-Type: multipart/related;
X-Mailer: Microsoft Outlook 14.0
Content-Language: pt
Thread-Index: Ac9CrcIZpAeApXLaR8CwvETVzMByzA==
I've been fighting against this and i already turn off "Require RFC-compliant HELO" and even "Require HELO before MAIL" but nothing seems to work. I disabled DKIM, SPF, enabled again, and nothing works. How can I solve this? My clients are angry (I understand that) and there's nothing more I can do by now.

The problem is not only on Outlook (yes, i tried "my server requires authentication"). Even when I try to send a email to those specific webmails by Cpanel software I receive that error.

Can you help me?