Alabama holds a special election for U.S. Senate on December 12, 2017. Because the Alabama ballot access laws are so severe, only the Republican and Democratic nominees will be on the ballot. However, the Libertarian Party has nominated a write-in candidate, Ron Bishop, and his candidacy has been mentioned already in the Birmingham and Anniston daily newspapers. See this story, for example.
Alabama permits write-in votes, but won’t tally them.
According to the Vice Chair of the Alabama Libertarian party, the write in votes will be counted.
The total number of write-in votes will be counted. Unless the write-ins affect the outcome, they will not go through them and count who received the write-in votes.