Gmail clips emails that have a message size larger than 102KB, and hides the full content behind a “View entire message” link.

Other email service providers such as Outlook may clip an email based on various factors such as total email size, organization policies and version.

What happens when an email is clipped

When an email provider clips the message, it also clips the tracking code that accounts for opens. This can result in strange Insights such as users having clicked a link in an email without having opened it.

To make sure all opens are tracked, and your full campaign content isn't hidden behind a link, it is important to make your message smaller than 102KB.

How to know if clipping will occur

Send a test email before publishing any campaign via email. Open the test email and scroll to the bottom to check if the message has been clipped.

For more information: Test for Email Success.

How to prevent clipping

Here are some ways to troubleshoot different issues that may cause an email provider to clip your email.

Change the subject line of test emails

Email providers often combine, or "thread," emails with the same subject line into a single email in your inbox. If you send several test emails for the same campaign, this can lead to the message becoming so large that the test email is clipped. When your email is sent to contacts, the content will be sent only once, so clipping shouldn't occur. However, for testing purposes, you can change the subject line or delete the previous test emails in your inbox, and then send the test email again.

Avoid copy and paste for content

If you pasted content from an outside source, such as another website or a word-processing program, then it is possible that extra, hidden formatting code was added to your campaign's underlying code. This increases the size of the delivered email.

To avoid accidentally adding this extra code, paste as plain-text (Ctrl + Shift + V on Windows, Cmd + Shift + V on Mac) when you add content to your campaign.

Cut any unnecessary content

If the above options don't seem to help prevent clipping, it’s likely that your campaign just has a lot of content. The first recommendation would be to cut any content that may be unnecessary.

Here are some tips to keep in mind when you start to cut content:

• Use links to include content from other sources. If information can be found in another campaign or website, include it as a link instead of copying and pasting its content.
• When you change the size of a particularly large image, it does not reduce the size of the message.
  Message size is based on the total number of bytes in the email's code. Because images are loaded into emails from an external source, such as from our servers, the image size does not affect the size of the message. However, deleting an unnecessary image from a campaign would remove its associated code, which would reduce the message size.