Mail app font issue after macOS Tahoe 26.0 update

Question

Level 1

4 points

Mail app font issue after macOS Tahoe 26.0 update

After updating to macOS Tahoe 26.0 the 'default' or 'fallback' font in my Mail app does not match my system font. It appears to be Impact or some similar extra bold font. This impacts emails across the board in random spots within the message.

I already tried:

Font Utility -> Settings -> Reset Fonts -> Reboot system. The problem persists.

System info:

2024 Mac Mini M4

macOS 26.0 (25A353)

Example email (black boxes with sensitive info redacted):

"Category" clearly is not using a heavy bold font, per html from .eml file:

:Nunito, Helvetica, Arial, sans-serif;font-size:16px;line-height:1;text-ali=

gn:left;color:#687782;">Category</div>

And this is how it is supposed to render on Gmail.com in Safari:

Mac mini

Posted on Dec 7, 2025 12:37 PM

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Answer 1

Tom Gewecke

Level 10

122,022 points

Dec 7, 2025 4:12 PM in response to whoopseez

If I read you post correctly, it looks like you have an example of the email html font codes being treated differently in Safari and Mail, with the former being correct. I suggest you report this to Apple via

http://www.apple.com/feedback

and include a link to this discussion so they can see your images and code.

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Answer 2

Dec 7, 2025 1:20 PM in response to whoopseez

whoopseez wrote:

1. After updating to macOS Tahoe 26.0 the 'default' or 'fallback' font in my Mail app does not match my system font. It appears to be Impact or some similar extra bold font. This impacts emails across the board in random spots within the message.

I already tried:

Font Utility -> Settings -> Reset Fonts -> Reboot system. The problem persists.

System info:

2024 Mac Mini M4

macOS 26.0 (25A353)

I have no idea what interface that is... maybe it is not your issue but the email received and some html you have no control(?)

From the Font Book.app>Settings>Advanced>Reset Fonts

Mail.app>Settings>Fonts

Mail.app pick fonts in mail that are part of the system fonts(?)

The current stable release of Tahoe including bug fixes, security updates is macOS 26.1

Keep your Mac up to date - Apple Support

if this is some isolated one off issue— I think I could easily not worry about it.

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