Keep the copy short and concise, generally under 500 characters, or 100 words. Be concise as you’ll have a character limit of 1900, tracked in real-time as you type your message.⁵ This translates perfectly to InMail, since more than 50 percent of these messages are opened on smartphones, and often by busy professionals.
Show you respect the prospect’s time by writing a short message that is easy to digest. Write in plain, easy to-understand language, with a goal of starting a conversation.
Research by Boomerang showed that sales emails written at a third-grade reading level had the highest response rate.
These performed better in terms of open rate than those written at a college reading level
And boasted higher response rate than emails composed at a high school reading level⁶
Remember that you can add relevant content to your InMails, including PDFs, word files, and images to messages, up to 200 MB.