1
Test in Outlook on the web
If the same signature breaks in both desktop Outlook and the web client, stop treating it as only a local Outlook-profile problem.
Everyday IT · Outlook
Prove whether the signature is broken in Outlook, in the mailbox, or after send.
Signature issues often survive restarts and repairs because the real problem is formatting, synchronization, or centralized mail processing.Build one clean test signature and compare Outlook with Outlook on the web.
2
Create a minimal clean signature
Use simple text and basic HTML rather than copying a complex signature from Word. A clean test can prove whether hidden formatting is involved.
3
Check message format
Confirm the affected message is being composed in the intended format. HTML and Rich Text can render signatures differently.
4
Compare before send and after send
Check whether the signature changes only after sending, only for internal recipients, or only when reopened from Sent Items.
When the problem is broader than one user
Roaming
Signature synchronization can matter
If multiple clients share signature state, determine whether a synced or roaming signature feature is involved before rebuilding the same signature repeatedly on each device.
Mail flow
Central signature rules can modify messages
If signatures are appended or altered centrally, review the mail-flow or third-party signature layer before changing each workstation.
Escalate
Multiple users reproduce it in web and desktop
That pattern points beyond a single local profile and may require tenant-level or vendor investigation.
A clean test signature is evidence. Copying the broken signature again is not.