We’re running into an issue with Laserfiche Forms email notifications and approval emails failing when sent to external recipients (notably Gmail). Internal delivery works without issue.
Error messages indicate DMARC failures. After reviewing message headers with our sys admin, it appears Exchange is treating the messages as MAPI/internal mail rather than true SMTP, so DKIM signing is not being applied. When those messages leave the tenant, they fail DMARC enforcement externally.
Key details:
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Laserfiche Forms SMTP configured to smtp.office365.com
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Port 587, secure connection enabled
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Authenticated send using a dedicated mailbox
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Validation email from Forms config succeeds
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Internal recipients receive mail normally
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External recipients reject due to DMARC/DKIM
Has anyone else seen Exchange classify Forms-generated emails as internal/MAPI despite SMTP submission?
If so:
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Was this resolved via Exchange transport rules?
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DKIM configuration changes?
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Dedicated SMTP relay / connector?
Looking to confirm whether this is expected behavior with O365 + Forms and what the recommended fix is from others who’ve hit this. Any help or guidance would be greatly appreciated!