We are writing in connection with

You usually put this right at the beginning. Start your email with a polite greeting first. Then, use We are writing in connection with followed by a noun. For example, use it with your order or the meeting. It works best when there is a previous interaction. You are reminding them of a shared context. It identifies the subject immediately.

Use this in formal business emails. It is perfect for job applications or legal matters. Use it when you represent a company or a team. It makes you sound like a polished professional. It is great for following up on a conversation. Use it when you want to be taken seriously. Use it for official inquiries too.

Do not use this with your best friends. It will make you sound like a robot. Avoid it in casual group chats about dinner. If you use it while texting, people might think you are mad. It is too heavy for a quick "hello." Keep it away from very emotional, personal letters. It feels too cold for close relationships.

This phrase comes from a long history of formal letters. In the past, people wrote very long, flowery introductions. This is a modern, slightly shorter version of those old traditions. It shows that you value professional boundaries. It is very common in UK and US office culture. It signals that "business has started" now. It shows respect for the recipient's time.

You can say I am writing in connection with for yourself. A very common alternative is I am writing regarding. If you want to be even more formal, try With reference to. For a slightly softer tone, use I am reaching out about. Each one changes the "temperature" of the conversation slightly. In relation to is another common professional choice.