Since 2003 the internet has changed. We no longer get a message to say that we have a message. Instead we just give you the message. You probably never use the messages component (especially for private message to a specific user) as they are the equivalent of https://www.youtube.com/watch?v=gFBLiHpkcOk

The Joomla com_messages component is used in two instances

1. Notification of a new article
2. Sending a message to another user

### Current email for Notification of a new article
Subject: A new private message has arrived from [sitename]
Body:
> Please log in to [link] to read your message.

### New email for Notification of a new article
Subject: New message from [user] at [sitename]
Body:
> New Article
A new Article has been submitted by 'user' entitled 'blog post'.
> Please log in to [link] to read your message.

### Current email when sending a message to another user
Subject: A new private message has arrived from [sitename]
Body:
> Please log in to [link] to read your message.

### New email when sending a message to another user
Subject: New message from [user] at [sitename]
Body:
> [subject]
 [message]
[login link]

## Backwards Compatibility
No issues. The message contains the old login message PLUS the content of the message. So if you were using this message in a custom workflow there is no change required to that workflow