Please consider the following: A Jewish man who is not a mamzer engages in sexual relations with a Jewish woman who is not a mamzer but who is legally/Jewishly married to a different Jewish man. The married husband and wife do not engage in sexual relations and the woman exclusively has sex with the man who is not her husband. The woman and her lover conceive a child that is, with certainty, born a mamzer. What is the resultant halachic status of this "lover" who illicitly fathered this child with her? Does he, the father of the child born a mamzer, also become a mamzer? If not a mamzer, does he carry some other negative status that would affect subsequent Jewish children born to him?
Father --> Not a Mamzer
Mother --> Not a Mamzer, but married to someone else
Offspring of this forbidden union -- Mamzer
Does the fact that the father created a mamzer reflect on him in any way? If so, can that affect other (non-mamzer) children born to him?