AboutMyEmail: Free Email Testing Tool for Headers and Compliance
Test email headers, authentication, and Yahoo/Gmail compliance with AboutMyEmail. Get detailed reports on SPF, DKIM, DMARC, BIMI, and more from this ...
MIME Type
Also known as: MIME
MIME types are labels that tell email clients what kind of content each part of a message holds. They make sure text, HTML, images, and attachments show up the way you expect.
MIME, short for Multipurpose Internet Mail Extensions, is a standard that labels each piece of an email. It tells the inbox if something is plain text, HTML, an image, or a file. Email services read these labels to decide how to show your message. This keeps emails readable across different devices and apps.
For email marketers and developers, MIME matters because it controls how templates, images, and attachments load. A clean MIME setup keeps layouts stable, tracking pixels working, and branding consistent. When types are wrong, some clients show raw code or broken images. That hurts trust and can drag down your results.
In practice, use a platform that sends a multipart message with both HTML and plain text versions. Check that each asset has the right type, like text/html for your template and image/png or image/jpeg for graphics. Test sends in a few inboxes before launch and watch for missing parts or strange layouts. If something looks off, MIME headers are one of the first areas to review.
Related Terms
HTML
HTML is the code that shapes how your email looks and feels in the inbox. In email marketing it uses a simpler, stricter version of web HTML so your design works across many different clients.
Learn more →Attachment
A file that travels with an email message, like a PDF or image. Attachments are fine for one-to-one emails but risky for bulk marketing sends because they can hurt deliverability.
Learn more →Email Client(Email Program)
Software or apps people use to read, send, and manage email, such as Gmail or Apple Mail. Different email clients can display the same email in different ways, which affects how your emails look and perform.
Learn more →Alternative Text(Alt Text)
Short text that explains what an image shows and why it is in your email. It helps people and email clients understand your message when the image does not load.
Learn more →