7,925 questions
Check the recipients blocked sender list:
https://practical365.com/smtp-554-5-1-0-sender-denied-caused-mailbox-junk-email-configuration/
554 5.1.0 Sender denied
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(44.800000000000004, 9%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EN%3C/text%3E%3C/svg%3E)
Nicholas94
316
Reputation points
One of our members of staff is trying to communicate with an external client, but the inbound emails keep getting blocked. I check on our cloud-based filter and it says the emails are being rejected by our Exchange 2013 server with the error 554 5.1.0 Sender Denied. I've added the client to bypassed senders, recipients and sender domains in Content Filtering, but the emails still aren't getting through.
Exchange | Exchange Server | Management
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Yuki Sun-MSFT 41,376 Reputation points Moderator2021-12-01T02:53:18.407+00:00 Hi @Nicholas94 ,
Is this only affecting the particular user?
Are the other users in your organization able to receive emails sent by the external client?Besides, regarding the error "554 5.1.0 Sender denied", agree with Andy that it's suggested to have a look at the Junk Email settiing on the user's side. Below is a thread which discusses a similar issue for reference: 554 5.1.0 Sender Denied.
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Yuki Sun-MSFT 41,376 Reputation points Moderator
2021-12-06T09:30:04.167+00:00 Hi @Nicholas94 ,
Just circling back to check how things are going on with this thread. If you have any questions or need further help on this issue, please feel free to post back.
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Andy David - MVP 157.9K Reputation points MVP Volunteer Moderator2021-11-30T17:17:04.397+00:00