Mail inline

You're referring to "mail inline" as a shorthand for "mailing inline" or "including the original message in the reply".

In email etiquette, "mail inline" means that when you reply to an email, you include the original message or a portion of it in your reply, rather than just addressing the sender and starting a new message. This helps to keep the context of the conversation intact and makes it easier for the recipient to understand the purpose of your reply.

For example, if someone sends you an email asking about a specific topic, you might reply with a message that includes the original question and your response, like this:

Original message: "Hi, can you tell me more about the new product features?"

Your reply: "Hi, thanks for reaching out! Yes, the new product features include [insert details]. I think you'll find them really useful. "

By including the original message in your reply, you're providing context and making it easier for the recipient to understand your response. This is especially important in long email threads or when discussing complex topics.