When you send an email, you can request a read receipt from the people you're contacting. This is a mechanism to ask the person receiving your mail to notify you when they've read it.
This functionality is usually only supported if your recipients are using Outlook or Thunderbird. Even if they are, they can still opt not to respond with a read receipt.
To request a read receipt: when composing an email, use the More button near the message header to access additional functionality and select Request Read Receipt.
The Fastmail web interface does not respond to requests for read receipts, but will display receipts others have sent to you.
When you send an email, you can choose to mark it as "high priority"; this tells the receiver that you believe your message should be considered urgent.
To set high priority: when composing an email, use the More button near the message header and select Mark as High Priority.
Be aware that not all email clients will display if an email is marked as high priority.
To display the importance rating of an email in the Fastmail web interface, you need to add extra headers to the standard display.
- Go to Settings → Preferences under Reading.
- Open the Advanced preferences and use Extra headers to add the
X-Priorityheaders. Add each header separately.
- Now when you view a message, you can select Show details and the extra information will be there.