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Home / Unable to Authenticate Against the Smtp Server. Please Check Your Settings and Try Again.

Unable to Authenticate Against the Smtp Server. Please Check Your Settings and Try Again.

Exchange server uses Simple Mail service Transfer Protocol (SMTP) to send emails from an electronic mail client to the server and vice versa. It is responsible for sending information over the network. In Exchange, after enabling the IMAP or POP3, you must configure the authenticated SMTP settings for users so that they can send emails.

Sometimes, the email delivery may fail and the post-obit bulletin may get relayed dorsum to the server - an SMTP fault code 550 5.7.i,

"The SMTP mail system returned the following fault: (0x8004020F): The server rejected ane or more of the recipient addresses. The server response was 550 five.7.1 Unable to relay"

In a nutshell, this bulletin is a non-delivery report (NDR) or delivery condition notification (DSN) of emails. The error 550 5.7.1 by and large implies that the user is not authorized, and therefore, fails to send emails. As a result, the message is relayed back to the server.

What is SMTP Error 550 five.seven.1 Unable to Relay?

The error '550 5.7.1 Unable to relay' is a cryptic error code by HTTP protocol, which restricts users from sending emails. The error codes depict of import information virtually the persisting trouble. Information technology unremarkably consists of iii digits where each digit defines a particular attribute. In such a situation, you need to prepare the SMTP fault 550 past understanding the significant and reason for the occurrence. The description of the error 550 Unable to relay a message is as follows,

  1. The first digit describes whether the Exchange server accepts the control, encounters an error, or commences appropriate action.
  2. The subsequent digits display if any connection or syntax error exists. It can exist considered as a security-specific error message if it prevents unauthorized users from gaining access to the Exchange server for relaying emails.

What Factors are Responsible for SMTP Error 550 5.vii.1 'Unable to Relay'?

There could be various reasons responsible for the occurrence of Exchange SMTP error 550 Unable to relay fault. These are:

  1. Authentication failure/don't have permission to send messages to the recipient
  2. The sender address is non recognized by the Outgoing Postal service Server
  3. Exchange database corruption
  4. The Recipient Policy of the recipient domain blocks the emails from the sender domain
  5. Email routed to the wrong server
  6. Sending an electronic mail to a big distribution group

Most commonly, the reason could be database corruption or the nonexistence of a specific Recipient's policy for the particular domain in the user'due south department in the Exchange server database(s) that results in this error message.

How to Fix Exchange SMTP Error 550 v.7.i 'Unable to Relay'?

Below we have provided a few manual solutions to fix Exchange Error 550 5.7.1. However, y'all may require considerable technical expertise to execute the steps. Hence, good know-how of the Commutation server processes is essential. Yous also need administrator access and permissions to execute the commands and steps discussed below.

Method 1: Check Event Logs

Bank check for all existing Exchange server errors in the application event log and search for corresponding resolution methods online. Checking the application result logs volition help you clarify the actual cause and fourth dimension when the 'Exchange SMTP Error 550 5.seven.1 unable to relay' error message is generated.

Method 2: Contact Recipient or Recipient's Email Admin

Every bit mentioned earlier, if the sender's address is not recognized by the Outgoing Mail Server, the email delivery may neglect. In such a case, you lot may contact the recipient or recipient's e-mail admin to fix the trouble from their end. Tell the admin or the recipient about the electronic mail commitment problem and ask them to reconfigure the recipient's mailbox. This may help you stop the SMTP mistake 550.

Method iii: Use Exchange Server Manager

Y'all can use the Substitution Server Managing director to gear up the failed email commitment upshot and the Exchange SMTP error 550 5.7.ane Unable to relay. The steps are equally follows:

  1. StartExchange Server Manager
  2. Go toAdministrative Groupsin the Exchange Server Managing director
  3. SelectAdministrative Grouping Proper name, select Server, and and then theServer Name
  4. Adjacent, click onProtocols and selectSMTP
  5. Then right-clickDefault SMTP Virtual Serverto select Properties
  6. Click on the Accesstab and then click on Relay to select just the list below
  7. Next, select theIP that you lot want to relay and the domain
  8. Finally, check the box associated with "Allow all computers which successfully cosign to relay regardless of the list in a higher place"
  9. Close all opened tabs. The SMTP Server at present enables you to send emails

Method 4: Use EseUtil

Sometimes, the SMTP error 550 5.7.1 may likewise occur due to a problem with the Exchange database file (EDB). Common factors, such equally virus or malware intrusion, power failure, force shutdown, incompatible antivirus software, or server crash, may cause database corruption that can lead to the 'Exchange SMTP Fault 550 Unable to Relay' error. To fix database abuse, you can apply the EseUtil, an Exchange built-in utility offered by Microsoft. You tin can also use EseUtil, which is located at C:\Program Files\Microsoft\Substitution Server\Vxx\Bin, to bank check database integrity, defragment the database, and reduce the database size.

Post-obit are some EseUtil commands that you tin can utilise to perform various operations on the Exchange database.

  1. Defragment Database

ESEUTIL /D

defragment database

  1. Cheque Database Integrity

ESEUTIL /1000 < path to database file>

check database integrity

  1. Perform Soft Recovery

ESEUTL /P

In Exchange 2010 and earlier versions, you need to use the Isinteg as EseUtil is bachelor in Commutation 2010 SP1 and later versions merely.

Isinteg –s

  1. Perform Hard Recovery (May cause Information Loss)

ESEUTIL /C

TIP: Ever dismount the database and create a fill-in copy of the database before performing whatsoever performance on the Substitution database file.

Method 5: Apply an Exchange Recovery Software

The probabilities to resolve the error via EseUtil is based on the intensity of corruption in the EDB files and incorporated objects. Plus, it may cause permanent data loss, if hard recovery is performed. Thus, in case of severe corruption and to avoid data loss, it is e'er better to deploy a professional person Substitution recovery software, such as Stellar Repair for Exchange.

Free download

The Exchange recovery software repairs decadent and damaged Commutation database files, extract the mailboxes, and saves them equally PST without whatever information loss. You may likewise import the extracted mailboxes and mailbox items to the live Exchange server directly past using the software. Plus, it too helps Exchange admins to recover and restore deleted mailboxes from Exchange 2019, 2016, 2013, 2010, 2007, 2003, 2002, 2000, and Exchange 5.five database files in a few clicks.

Final Thoughts

The 550 5.7.1 Unable to relay SMTP fault can be resolved by post-obit the manual methods discussed in this guide. All the same, these methods piece of work only if the reason for SMTP 5.7.1 error is due to authentication, recipient policy, and permission related problems. These methods won't work if the problem is caused due to integrity issues with the Substitution database file.

In such cases, you may use EseUtil to repair the database via soft or hard repair commands. Simply EseUtil may cause information loss and neglect to repair the database if the corruption is severe. To avoid data loss and restore mailboxes from a severely corrupt or damaged database, y'all tin utilize an advanced Exchange recovery software, such as Stellar Repair for Substitution. This can help you quickly fix the trouble with the Exchange database and avoid the Commutation SMTP fault 550 v.seven.1 Unable to relay error message.

Unable to Authenticate Against the Smtp Server. Please Check Your Settings and Try Again.

Source: https://www.stellarinfo.com/article/exchange-smtp-error-550-unable-to-relay.php