My answer is long and complicated, sorry, but that's the way my story reads. Yes, with mixed results. I have contacted the LTA MOW about a dozen times via email since my first DDay and the following 4 1/2 years. The first email I sent 8 months after DDay, when I found emails between them proving broken no contact, when I had been led to believe the A was long ago, with no contact for years. Her brief reply filled me with more lies, but I later realized I scared her off permanently, so I have no regrets for unknowingly ending an underground A and false R that went on almost a year.
Our subsequent exchanges have been questionable choices with mixed results, spanning years and the full range of my emotions, including my atonement for lashing out and forgiveness letter, and my white hot rage after learning the real truth email, not the other three versions I was led to believe. Her responses have ranged from pathetic, selfish, delusional and indignant to pleading to be left alone with a dash of regret thrown in. None of the level of regret, guilt or shame I would have expected given the length and depth of their deceit, and the damage the gaslighting did to my mental health.
Not until shamed into apologizing did anything resembling one show up, but that would be expected dealing with a selfish compartmentalizing liar. When she did apologize, the first was to my WH, of course, for how badly things ended up. I got the sorry, but nobody was supposed to know or ever get hurt story, followed by assurances that my WH loves me and my marriage is stronger than hers. I did not enjoy her insights at all and some of her words still sting a bit.
My experience is that it was great to scare her off, satisfying to hold so much power of disclosure and public humiliation over her head, good to vent my rage at her, almost fun to relay all the awful things he said about her or to reveal that she was not the only one, and not remotely special or unforgettable. Not so fun was opening myself up to her with so much honesty and humanity, because she was not deserving of my truth or my time. I do know that our correspondence was upsetting to her and she begged me repeatedly to leave her alone, and I would have, and intended to, but there was no bottom to their pit of lies, so I lashed out or reached out at each ugly revelation. Were it not for her eventual truthful disclosures, I would not know of multiple other lies of omission I had been fed, though. I have thanked her for for the truth and damned her for her lies over and over, but she gave me enough scraps of truth to help me understand what I was dealing with in a brutal R with a dishonest WH. So there's that.
If I had not contacted her, it would eat at me to this day to not have spoken my piece or asked my questions. But, each answer brought with it more questions. My biggest regret is not threatening her away on DDay 1, and giving myself a chance at R without the false in front of it. I guess I learned more about my WH from her than I did about her level of humanity, though.... I understand why so many here will advise to not waste your time reaching out, but for me, it provided crucial pieces of the puzzle, eventually. Worth lowering myself for a few more data points, but worthless regarding understanding another human's ability to disregard, deceive and hurt others.
BW: 65 WH: 65 Both 57 on Dday, M 38 years, 2 grown kids. WH had 9 year A with MOW, 7 month false R, multiple DDays from 2017 - 2022, with five years of trickle truth and lies. I got rid of her with one email. Reconciling, or trying to.