Dark mode — how your signature looks for recipients with dark mode on

More than 80% of modern mail clients support dark mode. MailManagers automatically generates smart color adjustments, gives you control over the palette, and offers a live Light/Dark preview toggle in the editor.

Which clients respect our dark-mode CSS?

| Mail client | Dark mode active? | |---|---| | Apple Mail (macOS + iOS) | ✅ Full | | Gmail Web | ✅ Full | | Gmail Mobile | ✅ Mostly full | | Outlook Web | ✅ Full | | Outlook Desktop Windows | ❌ No dark mode for mails — always shows light | | Outlook Desktop Mac | ✅ Full | | Yahoo Mail | ✅ | | Thunderbird | ✅ |

Three modes to choose

In the Colors tab of the signature editor there's a section 🌙 Dark mode colors:

• Auto (smart defaults) — we calculate suitable dark colors
• Custom — pick your own HEX for each element
• Off — let client decide (not recommended)

Per-image dark variant

In the Upload tab you can upload dark variants alongside your regular logo and photo. Logo with white background? Upload a variant with white-on-dark design. We detect dark mode at the recipient and show the right variant.

Live preview toggle

Above the preview panel you see ☀ Light | 🌙 Dark. Click to switch — preview shows immediately how the recipient sees it in both modes.