Embedded Files
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Core Limitations of Native MS365 Signature Pushing
Core Limitations of Native MS365 Signature Pushing
Feature / Scenario
Compose Window Preview
Placement on Replies
Mobile Device Support
Sent Items Visibility
Image Handling
Empty Field Logic
Native MS365 Transport Rules
❌ No. Signature added post-send
❌ Appends to the bottom of the email thread
✅ Appends server-side for all mobile emails
❌ Sent folder item does not display the appended signature
⚠️ Must use web-hosted absolute image URLs
❌ Leaves blank lines or requires messy rule branching
Native PowerShell / Settings
✅ Yes (OWA / New Outlook only)
✅ Placed directly under the last reply
❌ Does not sync to iOS/Android native apps
✅ Visible during drafting
⚠️ Limited inline image formatting
❌ Overwritten per script run
Third-Party Tools (I.e. Exclaimer)
✅ Yes (via Outlook Web Add-in)
✅ Placed directly under the last reply
✅ Complete server-side or add-in coverage
✅ Sent items update service available
✅ Automatic embedded/hosted image handling
✅ Dynamic suppresses missing profile fields
Always on. And always secure
Always on. And always secure
Exclaimer are the only email signature solution provider that’s both ISO and SOC 2 compliant. They also comply with HIPAA, and other global email disclaimer legislation like GDPR, CCPA, and ACSC.
Every region has their own legal requirements that affect their email disclaimers. But with Exclaimer, you can always feel confident about your email signature security.
Let’s see what your email signatures can do for you...
Let’s see what your email signatures can do for you...
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