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Email headers are the top section of an email message that includes the sender’s and recipient’s email addresses, the subject line, and other essential details. The header is the first thing that recipients see when they open your email, making it an essential component of your email marketing strategy.

Email headers can directly impact your email’s open rate and engagement, so it’s essential to ensure they are appropriately sized to display correctly on different devices.

Email header size guidelines

Email header size guidelines may vary depending on the email client or service you are using. However, it’s generally recommended to keep the header’s width within 550-600 pixels, which is the standard size for most email clients.

If your header doesn’t fit within this limit, it can cause issues with the layout and appearance of your email, leading to a negative user experience, and can even end up in the spam folder.

Factors to consider when designing email headers

When designing your email header, it’s important to consider the following factors:


Your email header should accurately depict your brand’s message and identity. Use colors, fonts, and images that represent your brand.


Ensure that your email header aligns with the purpose of your email campaign. If you’re promoting a special offer or a sale, consider highlighting that information in the header.


Keep your email header simple and uncluttered. It should look visually appealing and easy to read.

How Bouncer can help

Bouncer is an email verification service that ensures your email campaigns reach the right people by verifying the email addresses on your list. Our email verification software can also help you optimize your email headers and ensure they meet size guidelines, making your emails more engaging and increasing your chances of reaching the desired audience.

So, try Bouncer today and make the most out of your email marketing campaigns!