You can use URL links to emails outside of AltaMail. For example you can paste an email link into your notes app or use it as a bookmark. Tapping on the link URL will open AltaMail and show the email.

You can copy a URL from inside AltaMail. When you view an email or select an email in the list, use the action menu (square with box icon) to select 'Copy external URL'. This will copy the URL to the clipboard so you can paste it elsewhere.

You can build your own email URLS using this format:
openampro://viewEmail?mid=%3message-id.123%3e

The "mid" parameter is the "Message-ID" field inside the email header. The example above uses a message id header field of "".