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I assume we are talking only about emails here ?
What is your email program ?

Email options are a different ballgame when it comes to trying to restore and are most likely to fail, inserting an email into a database file is fraught with problems not only might it corrupt the database file thus loosing all emails in that database file (not what you want) and avast may not be able to work with all the different email programs database files.

If you don’t already know the email folders (in most email programs) are just files with multiple files crammed in there with some form of referencing where each email is within that (database) file. Messing with a database file could corrupt it with disastrous consequences, personally any email issues suspicious or suspicious I would just ‘delete’ rather than ‘continue’ or ‘block it,’ see example image.

Not that the suspicious alert differs from the standard shield alert for a file on your hard disk.

Also what was suspicious about the email as avast normally states that ?