Fix Microsoft Email to Gmail Blocked by Temporary IP Rate Limiting
Question details
Users are experiencing email delays or rejections when sending messages from Microsoft 365 or GoDaddy hosted accounts to Gmail addresses.
- Product
- Microsoft 365 / GoDaddy Email
- Device & OS
- not provided
- Scenario
- Sending individual emails or distributing mail lists to Gmail users from a Microsoft 365 or GoDaddy email account.
- Observed behavior
- Google delays or rejects the messages, sending a bounce-back report 1 to 2 days later stating that the Microsoft outbound IP address (often an IPv6 address) has been temporarily rate-limited for unusual unsolicited-mail activity.
Collect the complete non-delivery report (bounce message), ensuring you have the exact timestamp, recipient address, and the specific affected IPv6 address ready for your support provider.
Contact your email provider to escalate the IP block
Since the issue lies with Microsoft's shared server IP reputation rather than your domain, your email hosting provider must intervene to clear the block with Google.
This is an intermittent issue where Google rate-limits specific Microsoft outbound mail servers due to spam detected from other tenants sharing the same infrastructure. Because you do not control these servers, the resolution requires Microsoft or GoDaddy to work directly with Google to restore the IP's reputation.
Copy the full non-delivery report (NDR) or bounce message you received, paying special attention to the exact IPv6 address (e.g., 2a01:111:f400:fe59::71e) mentioned in the error.
Log into your GoDaddy or Microsoft 365 admin portal, navigate to the Help & Support section, and open a new support ticket regarding outbound email delivery failures to Gmail.
Provide the support agent with the complete NDR, timestamp, and recipient details. Explicitly state that the bounce message indicates a Microsoft outbound IP rate-limiting issue and request an escalation.
Pause mass mailings and use alternative methods
To avoid further delivery failures while waiting for Microsoft to fix the server issue, temporarily halt distribution lists directed at Gmail accounts.
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Frequently Asked Questions
Why is Gmail blocking emails from my Microsoft 365 account?
Google occasionally rate-limits specific Microsoft outbound server IP addresses (often IPv6) due to an unusual spike in unsolicited mail originating from those shared servers. It is an infrastructure issue and generally not a problem with your specific domain's reputation.
Can I fix the Microsoft to Gmail IP block myself?
No, because you do not own or administer the Microsoft outbound mail servers. You must contact your email provider, such as GoDaddy or Microsoft 365 support, to escalate the server issue to their engineering teams.
Will my domain's reputation be permanently damaged by this?
In most cases, no. The bounce messages specifically state that the IP address, not the sending domain, has been rate-limited. Once the IP reputation is restored by Microsoft, your mail flow to Gmail will return to normal.
Why did it take days to receive a bounce message?
Non-delivery reports (NDRs) for this specific IP rate-limiting issue often do not trigger immediately. The Microsoft server will typically retry sending the email multiple times before giving up, which can delay the bounce message by one to two days.
