HMRC secure mailbox - FYI

None Impact Identified Ongoing March 10, 2026

Incident Lifecycle

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Incident Timeline

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If you are experiencing issues when connecting to the HMRC Mailbox in Sage 50 Payroll, please follow the instructions in this <a href="https://gb-kb.sage.com/portal/app/portlets/results/viewsolution.jsp?solutionid=260113160420793">LINK</a>.
Mar 27, 2026 at 4:29 PM UTC
Identified
We have identified that customers in the UK are receiving an "It has not been possible to establish a connection to your HMRC Mailbox" error when trying to access the HMRC secure mailbox from Sage 50 Payroll.
If you are experiencing this issue please reach out HMRC’s Online Services Helpdesk and provide the following information:
- Inform them that your are obtaining a ‘Request failed, reason unknown’ error when trying to retrieve notices from the DPS.
- Last date a successful retrieval...
Mar 10, 2026 at 11:34 AM UTC
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