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Tenant Exceeded Threshold (5.7.705 )
5.7.705 Access denied, tenant has exceeded threshold.
This message occurs when too much spam or bulk mail has been sent by your organization and we place a block on outgoing mail.
Email is a crucial aspect of modern communication, and when your Office 365 tenant is blocked from sending email, it can be a major obstacle to your business operations. The error code 550 5.7.705 "Access denied, tenant has exceeded threshold" is returned when a large volume of spam or suspicious outbound traffic is sent from an Office 365 tenant. Common causes for this error include sending bulk mail, compromised admin accounts, and on-premises servers being used to send email without your knowledge.
In this guide, we will take a deep dive into the causes of the error code 550 5.7.705 and provide you with a step-by-step solution to overcome it. We will guide you through the process of troubleshooting and identifying the underlying problem, as well as providing you with the tools and resources necessary to prevent it from happening again in the future. Whether you are an email admin or an individual user, this guide is designed to provide you with the knowledge and understanding you need to keep your email flowing smoothly.
Don't let a blocked Office 365 tenant disrupt your business operations any longer. Follow our guide and learn how to troubleshoot, prevent and solve the issue of 550 5.7.705 error code. With our help, you will be able to unblock your tenant and send emails without interruption.
Common causes for exceeding threshold
- Sending bulk mail. Bulk mail violates the Office 365 Sending Limits .
- Compromised admin accounts
1: Understanding the Error Code 5.7.705
When you receive the error code 550 5.7.705 "Access denied, tenant has exceeded threshold," it can be a frustrating experience. This error occurs when too much spam or bulk mail has been sent from your organization, and as a result, Microsoft has placed a block on outgoing mail. As an email administrator, it is important to understand the cause of this error in order to remove the block and prevent it from happening again in the future. Common causes include compromised on-premises servers or compromised admin accounts that have been used to create connectors, which can allow spam to pass through your organization.
Run & Review & Read Microsoft 365 Defender Reports
Mailflow status report (Outbound) > Last 14 days > Filter: Outbound Only Export (csv) > "SrNo_OutboundEmail.csv"
Threat protection status (spam only) > Last 14 days > Filter: Outbound Only Export (csv) >”SrNo _OutboundSpam.csv"
Top senders and recipients -> Last 14 days > Export (csv)> “SrNo _TopSendReceive.csv"
Inbound messages report -> Last 14 days > Export (csv)"CaseNo _ConnectorReport.csv"
Mailflow Map -> Last 14 days
Outbound Connector report -> Last 14 days > View details table
Run & Review & Read Message Traces with StartDate 24 hours prior to the block:
- "Summary report" for All Tenant Traffic.
- "Extended report" for Top Sender Email Address.
- If the Top Sender Report shows high volumes from postmaster (ex. [email protected]) or from MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e (ex. [email protected].com) "Extended Report" for emails SENT by these addresses.
Review and remediate unexplained tenant objects
we have discussed the issue of receiving the error code 550 5.7.705 "Access denied, tenant has exceeded threshold" in Exchange Online. We have outlined common causes such as bulk mail, compromised admin accounts, and fraud and social engineering attempts. We have also provided steps for email administrators to investigate and fix the issue, including using various reports and message trace.
It's important to note that preventing this issue from happening in the first place involves making sure that your subscription does not expire and being aware of signs of fraud and social engineering attempts.
As a final question, we ask our dear readers, have you ever encountered this issue? If so, what steps did you take to fix it? Please share your experiences in the comments below.