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553 email error is normally related to SMTP authentication not being used. Most mail servers require that you authenticate with a valid user on that system, before you're allowed to relay a remote message out. However some mail administrators will also using the 553 error if a user doesn't exist or for various other reasons as well.

You should receive a bounce-back message from the server with a variation of email error 553 in the subject, and the body should contain your original message that you attempted to deliver.

Example bounce-back message

Return-path: <>
Delivery-date: Mon, 14 Nov 2011 05:13:57 -0800
Received: from mailnull by with local (Exim 4.69)
id 1RPwMH-0008Q0-2H
for; Mon, 14 Nov 2011 05:13:57 -0800
Auto-Submitted: auto-replied
From: Mail Delivery System <>
Subject: Mail delivery failed: returning message to sender
Message-Id: <>
Date: Mon, 14 Nov 2011 05:13:57 -0800
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
SMTP error from remote mail server after RCPT TO:<>:
host []:
553 5.7.1 Not an open relay, so get lost
------ This is a copy of the message, including all the headers. ------
Return-path: <>
Received: from chrisg6 by with local (Exim 4.69)
(envelope-from <>)
id 1RPwMG-0008Pm-5x
for; Mon, 14 Nov 2011 05:13:56 -0800
To: Recipient <>
X-Autorespond: On vacation
MIME-Version: 1.0
X-Loop: "On vacation" <>
Precedence: auto_reply
X-Precedence: auto_reply
From: "Sender" <>
Content-type: text/plain; charset=ansi_x3.110-1983
Subject: Email acknowledgement from Sender

Common variations of the 553 email error

  • 553 5.7.1 Not an open relay, so get lost
  • 553 Invalid user.
  • 553 message blocked, you are not authorized to send mail, authentication is required.
  • 553 Null Sender is not allowed.

  • 553 5.1.1 sorry, no mailbox here by that name.
  • 553 #5.1.8 Domain of sender address <> does not exist
  • 553 5.3.0 <>... Address does not exist
  • 553 5.3.0 <>... No such user
  • 553 5.3.0 <>... No such user here
  • 553 5.3.0 <>... User unknown, not local address
  • 553-Message filtered. Please see the FAQs section on spam\n
  • 553 <> does not have a mailbox here
  • 553 does not accept mail sent to
  • 553 sorry, no mail-box here by that name. (#5.1.1)
  • 553 sorry, no mailbox here by that name (#5.1.1)
  • 553 sorry, rcpt user invalid (#5.7.1)
  • 553 sorry, that domain isn't in my list of allowed rcpthosts
  • 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
  • 553 sorry, the recipient in not a valid user on this domain (#5.7.1)
  • 553 sorry, this recipient doesn't exist.
  • 553 sorry, this recipient is not in my validrcptto list (#5.7.1)
  • 553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)
  • 553 Your email address is denied.

Resolving a 553 email error bounceback

The 553 series of errors would typically be a hard bounce, and usually your message is rejected right away. For a better understanding of a soft or hard bounce is, and general email bounceback errors you can read why does email bounce, bounceback, or error?

In our example bounce-back error above the reason the message has failed is because of a misconfigured auto-reply that has failed to first authenticate with the mail server before attempting to relay a reply to a message.

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n/a Points
2014-11-20 7:31 am

Your message did not reach some or all of the intended recipients.


      Subject:    Test

      Sent: 11/20/2014 4:36 PM




Mail was sending from ms outlook to gmail server.


The following recipient(s) cannot be reached:


      '**********' on 11/20/2014 4:36 PM

            Server error: '553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)'


Am usong ms outlook 2010... Pls suggest any solution ...

17,726 Points
2014-11-20 11:16 am
Hello Bhaskar,

Thank you for contacting us. I found a post regarding the 553 error on Microsoft's Official 2010 forums, where they suggest checking your email settings.

You can view your email settings in cPanel at any time.

Thank you,
n/a Points
2015-04-17 7:11 pm

Hi all

I have problem with my outlook 2007, this case i can connect to zimbra pop3 by outlook but cannot send out. i already use smtp port 25, 465 and 587 but still cannot send out the msg. this is the content msg "Send test e-mail message:   The server responded: 553 5.7.1 <"

can someone help me with this case!???


Best Regards

29,167 Points
2015-04-20 7:36 am
Hello Joseph,

Have you ensured the SMTP authentication setting is enabled?

Kindest Regards,
Scott M
n/a Points
2015-04-21 2:04 am

Hi Scott

Thanks a lot my friend, but where can i find SMTP Auth.?? did you mean SMTP Authen. in mail server configuration or in pc cliean

Best Regards

Joseph dRego

17,726 Points
2015-04-21 2:11 pm
Hello Joseph,

Thank you for your question. The "SMPT requires authentication" setting i covered in our Outlook 2007 setup guide.

Thank you,
n/a Points
2015-07-14 1:10 am

Good day

the email is just bounce back with this--->

Remote host said: 553 Access Denied

5,114 Points
2015-07-14 11:17 pm
Hello Marvin,

Can you please provide the full header section of the bounce back as it should provide more information than just that part of the error. Alternatively you can use our Bounce Back Parser to have it take a second look at the error.

Best Regards,
TJ Edens

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