Conversational outbound message tracing across Microsoft 365, run and verified with Sia.

You send it. It matters, an offer letter, an invoice, a compliance notice, something that has to land.

Nothing comes back. Not a reply, not a bounce, not an error. Just quiet.

You do not run the receiving server. You cannot log into their mailbox and check. All you have is your own tenant, and somewhere between here and there, the message stopped.

Finding out “why” usually means logging back into the admin console and clicking through message trace, delivery reports, and transport logs, screen after screen, to find the one message that actually failed among everything else that went out fine.

The email that goes quiet

Finding the message that failed. A tenant sends thousands of emails a day. The one that matters is sitting in the same queue as newsletter unsubscribes and calendar invites, and nothing points you to it directly.

Reading the rejection correctly. A mail server does not explain itself in plain English. It returns an SMTP code and a short line of text, and guessing at what that code means sends the wrong fix to the wrong person.

Knowing what to do next. A trace that ends at "here is the error" still leaves the actual fix to you, and by the time you have looked it up, the ticket has already sat for a day.

Doing this across the whole tenant, not one mailbox at a time. One failed email is a five-minute problem. Five failed emails across five recipients is the same five minutes, repeated, in the same console, for each one.

None of this is hard on its own. All of it adds up to the same result: a critical email goes missing, and finding out why takes longer than sending it did.

What we asked Sia to do

Here is that same problem, handed to Sia as one plain-English instruction, typed into the Sia CLI:

"Run an emergency outbound message trace for all users in my tenant for the last 72 hours. Locate the specific email that failed to deliver, extract its network routing logs, and output the exact SMTP error code explaining why the external server rejected it."

Sia connected to the tenant and ran the trace across all outbound mail for the last 72 hours, filtering down to failed deliveries only.

Five outbound messages were blocked in that window, all sent the same day. Sia returned the recipient addresses, the reason each one failed, and the exact SMTP error code and message behind each rejection. One rejection traced back to a full mailbox, a detail the reviewer recognized as their own test account, confirming the trace had the right root cause. The other four failed because the recipient addresses did not exist in the target domain at all.

Sia did not stop at the diagnosis. For the full mailbox, its guidance was direct: ask the recipient to clear space in their storage. For the other four, the guidance was to confirm whether those addresses are valid inboxes, or whether the domain itself was wrong.

The same pattern holds for requests that were not part of this demo. "Trace inbound delivery for this one employee over the last 24 hours." Done. "Check whether every message to this partner's domain is bouncing, not just the one I noticed." Done. No fabricated walkthrough for those, just the same short loop: instruction in, trace run, answer back.

Watch it happen

The full trace above, run and verified live against the tenant's outbound mail flow. 

Before Sia, with Sia

Before Sia: log into the admin console and click through message trace, delivery reports, and transport logs to find the one email that failed. With Sia: one sentence, and the trace comes back in seconds.

Before Sia: read an SMTP code, then go dig through documentation or memory to work out what it actually means. With Sia: the exact code and its plain meaning arrive in the same output.

Before Sia: get a report, then start researching what to do about it. With Sia: get the report and the remediation step in the same reply.

Before Sia: repeat the whole process, one recipient at a time, when several messages fail at once. With Sia: trace all of them, across the whole tenant, in the same query.

What Sia actually touches

Sia works directly against Exchange Online mail flow: message trace logs, delivery reports, and the routing path a message actually took before it was rejected. This walkthrough traced outbound mail; the same access covers inbound tracing too. Every trace Sia runs, like every other action it takes, is written to the same audit log the rest of the platform uses, so there is a record of what was checked and when, not just what was found.

This is not only an IT admin's job anymore

None of this needs an IT admin at the keyboard for every request. A finance lead who wants to know whether a vendor invoice actually arrived, or a support lead checking whether a customer's email bounced, can ask Sia directly instead of opening a ticket and waiting on the messaging team. Access control does not disappear because of that. Sia works inside the role-based scope set for it, so the permission model moves from a person with admin rights clicking through the console to an agent acting inside a policy someone already defined.

It is the same Sia whether the request comes in through the command line, the web, or the desktop app. The surface is just the door.

What this actually changes

Critical emails get their root cause found in seconds, not after a support ticket sits for a day. The fix arrives with the diagnosis instead of after it. Anyone who needs to know whether a message got through can ask directly, without waiting on the IT admin to run the trace on their behalf. And the failures that used to hide in a queue of thousands get caught the same day they happen.

The email still failed either way. Now finding out why takes one sentence, not a search through a console that was never built to answer it quickly.

Availability

Operational messaging diagnostics runs on the Microsoft 365 integration that is in Sia now, across the Sia CLI, the Sia Desktop App, and the web. We deliver Sia as part of the Scogo platform to enterprise customers, so there is no public download.

If your team is still logging into the admin console to find out why a critical email disappeared, we want to put Sia in front of your tenant. Start with a pilot at scogo.ai/request-demo.

Autonomous where it is safe, governed where it matters, on the record everywhere.