When importing values for a Yes/No field into Raiser's Edge it is important to provide the correct data in your import files.  Perhaps you need to mark the "Is a Solicitor" or "Is Inactive" checkbox on the constituent record. Or, you need to turn the "Send Mail to this Addresss" checkbox off.  Whatever the case may be, when importing fields with a "Yes/No" value using Import-O-Matic, the following values are allowed:

Yes:
T, True, Y, Yes, 1, -1

No:
N, No, F, False or Blank (no value entered in the field)

For more information on the allowed field values for imports, please refer to Chapter 3 of Blackbaud's Raiser's Edge Import Guide.