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Mailbird for Windows wants the signature as it looks in a browser, not the raw HTML source.
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Copy the signature as it looks
Download your HTML signature file from your company signature page.
- Open the file in Chrome, Edge or Firefox. Leave Safari for this step. It can change the formatting when you copy.
- Click the signature, select all with Ctrl+A (Windows) or Cmd+A (Mac), then copy with Ctrl+C or Cmd+C.
Copy the signature as it looks. If you paste the raw code into a normal signature box, the email will show the code instead of the design.
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Open Identities
- Open Menu → Settings (or press Ctrl+,).
- Open the Identities tab.
- Select the account and click Edit.
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Paste and save
Paste into the signature editor with Ctrl+V. Click OK or Save, close Settings, and compose a test email.