Clients not able to send invoices from xero to my email

Remove Xero’s actual sending address or domain from Outlook.com’s blocked list and add it to Safe Senders; if invoices still bounce before reaching Junk Email, Xero must investigate the full delivery error because a Safe Sender entry cannot override every service-level rejection.

Check and unblock Xero in Outlook.com

Perform this while signed in directly to the affected Outlook.com account:

1. Select Settings → Mail → Junk email.
2. Under Blocked senders and domains, look for the address or domain Xero uses to deliver invoices.
3. If found, select it and click Remove. Microsoft documents that blocked senders are redirected to Junk Email rather than delivered to the inbox.^1^
4. Under Safe senders and domains, select Add safe sender.
5. Enter Xero’s exact sending address or domain, select OK, and then Save.^2^
6. Also check Settings → Mail → Rules and remove any rule that deletes or redirects messages from that sender or domain.
7. Ask one client to send a new invoice rather than resending the original message.

Ask Xero Support for the actual sending address or domain if it is not visible in the bounce. Do not assume it is simply xero.com, because automated mail can use a different sending domain.

If it still bounces

A Safe Sender entry mainly prevents accepted messages from being moved to Junk Email.^2^ Your quoted message indicates that the sending system received a delivery failure, so obtain the complete non-delivery report (NDR) from one client or Xero, including:

• The SMTP status code, such as 4.x.x or 5.x.x
• The “remote server returned” line
• The sending IP address, if shown
• The date and time of the attempt

NDRs contain the error code and technical details needed to determine whether the problem is temporary, an invalid recipient, sender authentication failure, or an IP/domain block.^3^

Then use the matching path:

• No specific SMTP code or only Xero’s generic message: give the complete NDR to Xero Support and ask them to escalate it to their email-delivery team.
• 5.7.511, “banned sender,” or a banned sending IP: this is sender-side. Xero or its email provider must request delisting; it cannot be fixed from your Outlook.com settings.^4^
• 4.7.500–699 or 4.7.850–899: Microsoft identifies these as temporary restrictions while suspicious activity is evaluated; Xero should retry and investigate its sending source if failures continue.^3^
• No Xero entry in your blocked list and repeated bounces continue: in Outlook.com, select Help, describe the repeated Xero delivery rejection, and continue to Still need help? → Yes to contact Outlook.com support.^2^

Because multiple independent clients receive the same bounce when sending through Xero, provide Xero with one complete NDR rather than only the generic summary. The exact SMTP code is the key evidence for distinguishing an Outlook.com account setting from rejection of Xero’s sending infrastructure.

References

1. [Classic Outlook](https://support.microsoft.com/outlook/mail/block-or-unblock-senders-in-outlook)
2. Safe Senders in Outlook.com | Microsoft Support
3. Email non-delivery reports and SMTP errors in Exchange Online
4. External senders - Use the delist portal to remove yourself from the blocked senders list and address 5.7.511 Access denied errors