overflow in Outlook 365
Partial overflow is partly supported in Outlook 365.
overflow-block & overflow-inline not supported.
Works in 4 of 21 · partial in 16 · not supported in 1
Which clients
- Works
- Thunderbird, HEY Mail, Fastmail, Superhuman
- Partial
- Gmail, Gmail Android, Gmail iOS, Outlook 365, Outlook (New), Outlook iOS, Outlook Android, Outlook for Mac, Apple Mail, Apple Mail iOS, Yahoo Mail, Yahoo Mail Android, Yahoo Mail iOS, Samsung Mail, Proton Mail, AOL Mail
- Not supported
- Outlook Classic
Your reader in Outlook 365 may not see overflow the way you wrote it, even if it looks right where you tested it.
What to do instead in Outlook 365
Content will always be visible; design for full content display
<!-- Show full content, or truncate server-side -->
<div style="max-height: 200px;">
Shortened content that fits...
<a href="https://example.com/full">Read more</a>
</div>Show the original
<div style="max-height: 200px; overflow: hidden;">
Long content that gets clipped...
</div>A free account opens all 21 clients and keeps your checks for 7 days. Create a free account →
What Outlook 365 does with overflow
The Emailens probe for overflow on a real install counted as Outlook 365, captured 14 Oct 2026. It shows the problem, not the fix. Where overflow is supported it shows: only one line shows.
caniemail: overflow is partly supported in Outlook 365.
This Outlook.com install drops the <style> in the head, so only inline styles apply.
Partial. overflow-block & overflow-inline not supported.
caniemail record, tested upstream 27 May 2025
- Partial.
overflow-block&overflow-inlinenot supported.
Your next question
- Does animation work in Outlook 365?
Works in 5 of 21 · partial in 1 · not supported in 15
fix - Does transform work in Outlook 365?
Works in 7 of 21 · partial in 1 · not supported in 13
fix - Does overflow-wrap work in Outlook 365?
Works in 2 of 21 · partial in 3 · not supported in 13 · 3 untested
fix - Does bimi work in Outlook 365?
Works in 9 of 21 · not supported in 11 · 1 untested
- Does clip-path work in Outlook 365?
Works in 8 of 21 · not supported in 13
- Does block-size work in Outlook 365?
Works in 7 of 21 · not supported in 13 · 1 untested
Questions
- How many email clients support overflow?
- It works in 4 of 21, partial in 16, not supported in Outlook Classic.
- What do I use instead of overflow in Outlook 365?
- Content will always be visible; design for full content display.
- Does overflow work in Outlook (New)?
- overflow is partly supported in Outlook (New). Outlook 365 and Outlook (New) differ on 1 feature: text-shadow.
To see what else in your email Outlook 365 does not support, paste the whole email.
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Real captures 14 Oct 2026 on 10 installs · caniemail (MIT) via @emailens/engine 0.18.22 · tested upstream 27 May 2025 · data last changed 10 Nov 2026 · Outlook (New) cells are the engine's mapping