Most of the big email providers use SSL encryption to encrypt users’ mail. In most cases, the SSL option will be automatically checked in email settings. To retrieve mail that has flagged up an error message the user may have to uncheck this option.
If the account where users retrieve mail supports SSL then they can select this option to have data sent through a secure connection.
If a company is setting up its own email service the IT team may need to check with their provider that they are also secured by SSL. This will eliminate security problems when sending out mail shots and individual mail.