---
title: "Mail Warning Icon | Free Download PNG & SVG | Lucide Line"
product: "Streamline Icons, Illustrations and Elements"
url: /icons/download/mail-warning--29182
canonical_url: "https://www.streamlinehq.com/icons/download/mail-warning--29182"
summary: "Clean line icon of an envelope with an exclamation mark. Used for email warnings, failed delivery, and message alerts."
---

# Mail Warning icon

The Mail Warning icon shows an outlined envelope with a folded flap and an exclamation mark beside it. Drawn in the line style on a 24px grid with a 2px stroke so it stays clear at small sizes. Use it for email warnings, failed delivery notices, message alerts, and inbox error states. It belongs to Lucide Line free set in the Lucide family.

## Preview

![Clean line icon of an envelope with an exclamation mark. Used for email warnings, failed delivery, and message alerts.](https://assets.streamlinehq.com/image/private/w_300,h_300,ar_1/f_auto/v1/icons/all-icons/mail-warning-bafa3.png?_a=DATAiZkSZAA0)

## Details

- **Name**: Mail Warning
- **Type**: Icon
- **Set**: [Lucide Line](/icons/lucide-line.md) — Lucide is a free and open source icon set created by Eric Fennis and team with modern design.
- **Family**: [Lucide](/icons/lucide.md)
- **Style**: Line, Stroke, Minimal
- **Category**: All Icons › All Icons
- **Default size**: 24px
- **Stroke width**: 2px
- **Pricing**: Free
- **License**: [ISC](https://lucide.dev/license)
- **Author**: [Lucide](https://lucide.dev/)
- **Formats**: PNG, WEBP, PDF, SVG, JSX
- **Tags**: mail, email, envelope, warning, alert, notification, unread, urgent, caution, exclamation

## Download

- [Download Mail Warning on Streamline](https://www.streamlinehq.com/icons/download/mail-warning--29182)

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