What are the steps that you do to recall an email sent by mistake or contains mistakes to a recipient outside your organization?

Well.. If you have sent to an outside organization, nothing can be done about it, since it went out of your enterprise mail gateway and you are not in control. What we can do is only to minimize the damage to the organization that may be caused by this mail.  Send a apology mail,  to the person to which the mail was sent, to clarify that,  this mail was sent to him wrongly, and request him politely to delete this mail from his mail box. Also caution him  that he may be under legal obligation to delete such a mail. Any damage resulting on our organization, may be liability of the recipient, provided you sent this request for deletion of mail from his in-box.

1. In Mail, in the Navigation Pane, click Sent Items.
2. Open the message that you want to recall.
3. On the Message tab, in the Move group, click Actions, and then click Recall This Message.
4. Click Delete unread copies of this message.

within same organization message can be recall but out side organization cant be.

If you are using Microsoft outlook then follow as mentioned below

1. Click on sent items select email which you need to recall,

2. Click on an icon at top " Other Action" and then

3. Select " Recall this message"

It is very simple to recall an email which sent to wrong person, click on sent items select email which you need to recal, click on an icon at top " Other Action" and than select " Recall this message"

agreed with the answer of Loraine Domingo