Is there a way to recall an email that has been deleted?
In Webmail, yes. Log in to your account there. Once in, right-click on Trash. On the bottom of the list is Recover Deleted Items. Click on it and you'll be given a list of deleted email. Select any, or all, item(s) and then click Recover To. It'll give you options on where to recover the mail. All this is within Webmail only. If you want to re-download them to your computer, go to where you put the undeleted email, right-click on the message(s), and click Mark as Unread. The email client on your computer will think the mail is new and grab it again.
Hope that helps.
Depends how long ago it was deleted, and what do you normally use to check your email,
In webmail, right click the Trash and recover deleted items
Retrieving data ...