ZapBounce and Dynamics 365
Dynamics 365 spreads addresses across Contact, Lead and Account entities, each with up to three email fields of its own. A clean applied to one entity leaves the rest as they were.
There is a second wrinkle specific to this platform's customer base. Dynamics accounts are largely enterprise, and enterprise recipients are largely on Microsoft 365, which rate-limits verification probes.
Three entities, three email fields each, one Microsoft problem
A Contact has emailaddress1, emailaddress2 and emailaddress3. So does a Lead, and so does an Account. Verifying the primary field only leaves two-thirds of the addresses unchecked.
Then the recipient side. Microsoft 365 throttles and blocks SMTP probe traffic from cloud addresses, which means a meaningful share of an enterprise Dynamics list comes back unknown rather than valid.
That is the honest answer rather than a failure, and those results are not billed. It does mean an enterprise list will show lower coverage than a consumer one, and knowing why prevents a wasted investigation.
How the data moves
Enumerate all three fields per entity
emailaddress1 through 3, on Contact, Lead and Account. A single-field pass is the most common mistake here.
Use the Web API with batching
Dynamics throttles API requests per user. Batch operations keep a hygiene job from consuming the budget your integrations need.
Add custom fields for the verdict per address field
One verdict field cannot describe three addresses. Three fields keep the information the three addresses were there to carry.
Expect unknowns on Microsoft-hosted domains
Plan the reporting so a high unknown share reads as expected rather than as a broken job. Those results cost nothing.
Setting it up
- Create verdict and check-date custom fields for each email field you actually use on each entity.
- Export addresses through the Web API using batch requests.
- Verify the combined set, which collapses duplicates across entities before billing.
- Write results back through batched update requests.
- Build a view filtering on the verdict for marketing list construction.
- Report the unknown share separately so a Microsoft-heavy list is not mistaken for a failed run.
Dynamics 365: common questions
Why do so many of our addresses come back unknown?
Because your recipients are on Microsoft 365, which rate-limits probe traffic from cloud addresses. It is the accurate answer, and unknown results are never billed.
Do I need to check emailaddress2 and 3?
If you use them, yes. They hold the alternate addresses that become useful exactly when the primary stops working.
Will a higher tier resolve the Microsoft unknowns?
No. The limit is on the recipient's side and no vendor can price their way past it.
Check a Dynamics 365 export today
100 free checks a month, no card. Unknown results and duplicates are never billed.