# Messages

> Write to your students, send files, and block or report when a conversation goes wrong.

**Messages** holds your conversations with students, unread ones first. The sidebar shows the number of unread messages.

- Pick a conversation to read it, or choose a student under **Write to a student** and **Start**. You can write to any student of the site.
- Press Ctrl or Cmd and Enter to send. A message can be up to 4000 characters.
- Attach a PDF, PNG, JPEG or WebP file of up to 10 MB with **Attach a file**. Without file storage configured, attachments are off.
- **Delete message** removes the text and the file from the conversation.
- While the page is visible, new messages, deletes and the **Seen** mark show up within about five seconds.
- **Seen** under your latest message means the student has read the conversation up to it.
- If a message goes unread for about five minutes, the student gets an email, one per unread stretch. Reading it cancels the email.
- You can send up to 8 messages a minute and 60 an hour.

A conversation is private to you and the student. If either of you reports it, owners and admins see a report with a copy of the reported message, not the conversation.

## Blocking a student [#blocking-a-student]

Choose **Block** in a conversation and confirm. The student can still book lessons, see their lessons and read the past messages, but cannot send new messages. You can still write to them. **Let the student write again** or **Unblock** undoes it, and blocked students are listed under **Blocked students**.

## Reports [#reports]

Students can report a message or a whole conversation. Owners and admins see the reports under **Reports** on this page. See [Moderation and reports](/docs/teacher/moderation).