Ensure that mapi is configured.
The "Mapi logon failure" message generally means that SQL Mail is unable to find a mail profile with which to start. Make sure that you have SQL Mail properly configured.
Another reason is that your mail profile is corrupted or the name of the profile is greater than 32 characters. You may want to try deleting the mail profile and re-creating it with a shorter name to ensure that you have a working mail profile