Emails that are too large are a pain for everyone. They may take a long time to load (frustrating your reader) or they may simply be truncated once they’ve hit their maximum size (frustrating YOU).
Gmail can be particularly unforgiving, displaying the first 102KB of the email and chopping off the rest. This means that essential elements, such as your calls to action, unsubscribe link and tracking codes may be removed.
Our advice? Reduce image file sizes by compressing them, adjusting their color and removing metadata.