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: <>
Envelope-to: sender@YourDomain.com
Delivery-date: Mon, 14 Nov 2011 05:13:57 -0800
Received: from mailnull by biz29.inmotionhosting.com with local (Exim 4.69)
id 1RPwMH-0008Q0-2H
for sender@YourDomain.com; Mon, 14 Nov 2011 05:13:57 -0800
X-Failed-Recipients: recipient@RemoteDomain.com
Auto-Submitted: auto-replied
From: Mail Delivery System <Mailer-Daemon@biz29.inmotionhosting.com>
To: sender@YourDomain.com
Subject: Mail delivery failed: returning message to sender
Message-Id: <E1RPwMH-0008Q0-2H@biz29.inmotionhosting.com>
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:<recipient@RemoteDomain.com>:
host RemoteDomain.com []:
553 5.7.1 Not an open relay, so get lost
------ This is a copy of the message, including all the headers. ------
Return-path: <sender@YourDomain.com>
Received: from chrisg6 by biz29.inmotionhosting.com with local (Exim 4.69)
(envelope-from <sender@YourDomain.com>)
id 1RPwMG-0008Pm-5x
for recipient@RemoteDomain.com; Mon, 14 Nov 2011 05:13:56 -0800
To: Recipient <recipient@RemoteDomain.com>
X-Autorespond: On vacation
MIME-Version: 1.0
X-Loop: "On vacation" <recipient@RemoteDomain.com>
Precedence: auto_reply
X-Precedence: auto_reply
From: "Sender" <sender@YourDomain.com>
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 <sender@YourDomain.com> does not exist
  • 553 5.3.0 <recipient@RemoteDomain.com>... Address does not exist
  • 553 5.3.0 <recipient@RemoteDomain.com>... No such user
  • 553 5.3.0 <recipient@RemoteDomain.com>... No such user here
  • 553 5.3.0 <recipient@RemoteDomain.com>... User unknown, not local address
  • 553-Message filtered. Please see the FAQs section on spam\n
  • 553 <recipient@RemoteDomain.com> does not have a mailbox here
  • 553 RemoteDomain.com does not accept mail sent to recipient@OtherRemoteDomain.com
  • 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.

Did you find this article helpful?

We value your feedback!

Why was this article not helpful? (Check all that apply)
The article is too difficult or too technical to follow.
There is a step or detail missing from the instructions.
The information is incorrect or out-of-date.
It does not resolve the question/problem I have.
How did you find this article?
Please tell us how we can improve this article:
Email Address

new! - Enter your name and email address above and we will post your feedback in the comments on this page!

Support Center Login

Social Media Login

Related Questions

Here are a few questions related to this article that our customers have asked:
Ooops! It looks like there are no questions about this page.
Would you like to ask a question about this page? If so, click the button below!
Ask a Question
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:


      '**********@gmail.com' 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 ...

13,552 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,

Post a Comment

Email Address:
Phone Number:

Please note: Your name and comment will be displayed, but we will not show your email address.

3 Questions & Comments

Post a comment

Back to first comment | top

Need more Help?


Ask the Community!

Get help with your questions from our community of like-minded hosting users and InMotion Hosting Staff.

Current Customers

Chat: Click to Chat Now E-mail: support@InMotionHosting.com
Call: 888-321-HOST (4678) Ticket: Submit a Support Ticket

Not a Customer?

Get web hosting from a company that is here to help. Sign up today!