This error message indicates that your Exchange 2007 server is not accepting the email because it thinks it is not the authoritative server for the domain of the recipient and assumes it should relay the mail back to the internet (and rejects that). Show
You need to add your external internet domain name to the list of accepted domains in the Hub Transport:
If you already have the domain named listed in the Accepted Domains List then this could mean that POPcon isn't actually talking to Exchange SMTP but to some other SMTP service active on the same server. In that case it would be best to circumvent the other SMTP service by moving both the Exchange SMTP and POPcon to another IP port. By default IP port 25 is used for SMTP. You can change the port number (for example to port 26) in the POPcon configuration under EXCHANGE and in Exchange and in the Exchange Management Console under Server Configuration, Hub Transport, Receive Connectors, Properties of the Default Receive Connector. If you're an Miscrosoft Exchange administrator, at some point, you're going to run into the dreaded SMTP error code 550 5.7 1. This 550 rejected error can be caused by different things, from a misconfigured firewall to a corrupted message queue. This blog will tell you how to identify and fix the problem. Stay calm and keep reading—we'll help you get your Exchange server up and running again. Why did I get the SMTP Error 550 5.7.1?First off, is 550 permanent failure for one or more recipients. Several elements are responsible for SMTP error 550, but before proceeding, let’s understand this error. What is SMTP Error 550 5.7 1? Email error 550 5.7.1 'Unable to relay a message' or 'Client was not authenticated' is an error code that prevents sending emails by either server or client. The meaning behind this particular set of numbers depends on what attributes it's related to—i.e., number 550 means "550 unable". The error occurs when you request an email but cannot receive it because of a configured firewall or anti-spam system. This can be due to blocking ports needed for SMTP traffic, accepting too many connections from remote hosts on your IP address range, consuming all resources available in those servers hosting them (e.g., bandwidth), etc. We will discuss the scenario later, but first, let's decode the meaning of 550 5.7.1
Now the reasons for an Exchange SMTP error 550; the most common ones are as follows:
It can be daunting, so how to deal with it. How did I fix SMTP Error 550 5.7.1 'Unable to Relay' in Exchange ServerFurther along, we will teach you how to solve email Error Code 550 5.7.1 with some simple manual steps, but it is not as easy or straightforward because technical expertise and administrator access are needed to execute these commands on your server computer where the issue lies. Method 1: 550 permanent failure for one or more recipientsYou may get the "550 permanent failure for one or more recipients" error if your server IP has been blocklisted. To fix this, you first need to confirm whether it is possible that spam emails are being sent from our network using those addresses and networks. Whether you're using a shared server or dedicated VPS, there's always the chance that someone might have hacked your system and started sending spam emails. But if this is not the causative factor, then do the following. Method 2: Contact recipient or recipient’s Email adminSometimes, the Outgoing Mail Server may not recognize a person's email address. If this happens to you and your message isn't deliverable because of it, then don’t hesitate to contact them or ask their admin for help as they will know how to fix any problem with receiving emails on that account from here on out. Method 3: Check event logsWhen an error occurs with Exchange Server, it's essential to check the application event log and search for resolution methods online. This way, you can analyze what caused the "Exchange SMTP Error 550 5.7 1 unable to relay" message to repair/fix any problems as soon as possible. Method 4: Use Exchange Server ManagerThe email did not deliver because of a problem on the server side. Many things may cause this, including exceeding storage limits or having an insufficient number of emails in your account for some reason- maybe you sent too many! To fix email error 550, follow these steps:
Method 5: Use EseUtilThe ‘Exchange SMTP Error 550 5.7 1’ may appear due to database corruption, often caused by virus or malware intrusion. The built-in utility EseUtil from Microsoft can be used to fix database corruption. It's located at C:\Program Files\Microsoft Exchange Server Vxx Bin. To use this tool, you'll need administrator privileges on the server. Method 6: Use an Exchange recovery softwareThe EseUtil program can help you recover your files if an EDB file has corrupted them. The chance of tasting success depends on how strong the corruption is in each database and object within it, as well as their size." So you can consider Stellar Repair for Exchange. The Stellar Repair for Exchange is a powerful tool to fix corrupt EDB files and incorporate objects. In the event of severe corruption, it will save all your essential data by recovering them from an infected system without performing any permanent loss or damage. The Exchange recovery software repairs corrupt files damaged Microsoft database files and extracts mailboxes without data loss. You may also import the extracted emails from PST into live Exchange server 2019 or 2016 directly by using this amazing tool. With this software, you can easily extract and export all emails from your Exchange server in a few clicks, which is great for restoring deleted mailboxes from an earlier version from 2000, 2002, 2003, 2007, 2010, 2013, 2016, 2019, and Exchange 5.5 database files. Summing upSo, what do you do when Exchange SMTP Error 550 5.7.1 Unable To Relay pops up on your screen? Hopefully, this blog has detailed some valuable ideas for troubleshooting and fixing the problem. Thanks for reading! Wondershare Recoverit - Recover your deleted and lost data from any disaster5,481,435 people have downloaded it. Recover accidentally deleted emails that were purged by mistake or lost due to unplanned system formatting. Recover all mailbox components within the files such as emails, attachments, contacts, calendar items, journals, notes, etc. Support all common email file types: MSG, PST, OST, EML, EMLX, MBOX, BKL, BKS, EDB, etc. Restore data from all kinds of storage drives like USB Drive, SD card, SSDs, HDDs, Floppy Disks, Pen Drive, etc. |