Guides
How to install a signature in each mail client, and why the same signature can look right in one and wrong in another.
Add your signature in Outlook
Step by step for Outlook on Windows, Outlook for Mac and Outlook on the web, including what to do when the pasted signature comes out oversized.
Add your signature in Gmail
Paste an HTML signature into Gmail on desktop, set it for replies, and fix the two things Gmail does that surprise people.
Add your signature in Apple Mail
Set an HTML signature in Apple Mail on macOS, and what to do about the iPhone Mail app, which strips formatting.
Email signature best practices
The rules that decide whether a signature renders correctly: table layout, sized images, real text, explicit colour, tappable links and one hosted logo.
Why your signature breaks in Outlook
Outlook renders through Microsoft Word, not a browser. Here is what that changes, and the five faults it causes most often.