Gmail clips messages over 102 KB (102,000 bytes). If you send a message and the HTML size exceeds 102KB, your Gmail subscribers will see the first 102KB of content, then the following:
When the subscriber clicks to "View entire message", your message will display in a new window.
For clipping, the size of the email is based on the email's HTML MIME type code. Images pulled from external sources, such as your image gallery, do not affect the size of the email for clipping purposes. The plain text MIME type element of a message does not count towards the clipping allowance.
Tips for avoiding clipped messages in Gmail
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Keep your messages concise. Highlight the key points in the message, then direct your audience back to your website to read more. This is easily done by adding hyperlinks to your messages.
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Avoid copying and pasting content from a website or word processing program. When copying your content from a website or word processor, you are copying the text styles as well, increasing the message size. We recommend creating your message directly in AWeber's message editor, or you can paste your content into an unformatted, plain text editor such as Edit Pad.
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Remove unnecessary styles. Using different fonts, and style changes in a single email will increase the size of your message.
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Remove unnecessary links. Every website link in the message adds to the message size. Having dozens of links rarely helps increase user click thru rates. Condense links to only what’s necessary. A half dozen social media icons in the footer of a message can easily add 3-5KB of size alone.
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Break your message up into more than one message. If your message is covering multiple topics, you could consider breaking up your message into two or three messages. By keeping your message content specific to one or a few items, this could help increase the engagement of your audience.