Getting intermittent hard bounces from Outlook/Microsoft recipients:
```
550 5.7.515 Access denied, sending domain HELP.HUEL.COM doesn't meet the required authentication level.
SPF=Fail, DKIM=Pass, DMARC=Pass
```
Setup: domain SPF managed via Sendmarc, mail sent through Intercom → Sparkpost EU. DMARC passes via DKIM alignment, so by DMARC's own rules this should be fine — but Microsoft is rejecting on SPF specifically.
I’m being told by Intercom that this is just an accepted loss with not being able to respond to these customers. Anyone else experience this?