The addressee and salutation may have been using a custom name format, which wouldn't update when the relationship was removed or the household dissolved.
  1. Search for and open the constituent record
  2. Select their Personal Info tab, then select the Personal sub-tab within that
  3. In the Name Formats section, click the drop-down next to any name format that shows the individual along with their former spouse's name
  4. Click Edit
  5. If the currently selected format shows "<Custom>", highlight another name format and click the Select button. NOTE: You can also edit the text next to "<Custom>" to remove the former spouses name if you would prefer to set it up that way
  6. Save