Outlook to Stop Displaying Inline SVG Files
Microsoft announced that Outlook (Web and Windows versions) will stop displaying inline SVG images embedded in email bodies. The change started rolling out in September 2025 and should reach all users by October, though the overall impact is expected to be minimal (affecting less than 0.1% of images). SVG attachments will continue to open normally.
The goal is to reduce security risks, since inline SVGs have been increasingly used in phishing and XSS attacks and are now common in ready-made “fraud kits.”
For email marketers, this means any part of your message that relies on inline SVGs might appear blank in Outlook, potentially affecting layout, readability, and click rates.
What to do: Replace inline SVGs with other formats (or use HTML/CSS buttons), add ALT text to every image, and run rendering tests specifically in Outlook before sending. If you use SVGs for logos, icons, or CTAs, update your templates and monitor click metrics by email client to assess any impact.
Source: Microsoft Outlook stops displaying inline SVG images used in attacks (Bleeping Computer)
Cloudflare Launches “Email Service” (Beta)
Cloudflare has introduced its Email Service (beta), focused on transactional emails and offering an ambitious goal: to reduce technical friction by eliminating API keys (using “bindings” instead), automatically configuring SPF, DKIM, and DMARC records in DNS, and optimizing for deliverability and inbox speed.
This matters because delayed or spam-filtered transactional emails can break authentication flows and hurt conversions.
For marketing and product teams, this means an easier, more secure, and high-performance way to send and receive emails, without managing a separate infrastructure.
Cloudflare promises low global latency, better observability, and a developer-first setup, turning email into a native part of the application rather than a standalone service. For businesses already using Cloudflare, this integration should help reduce domain authentication errors, a major deliverability challenge, and speed up testing.
Source: Announcing Cloudflare Email Service’s private beta (Cloudflare)
See you next time,
Fabrício
