Do Not contact them.. until you read the below
Not sure if you a paid member but Fathom gave me this reply to the same question i asked..
Do not try to feed them BS as they are far from stupid, be honest and sincere, if you have done something come clean and beg for forgiveness and tell them it will never happen again
"Any links that are within your control should be removed.
Any links that are outside of your control catalog them and report them to Google with your story and a re-inclusion request.
If the catalog is huge start a thread at [groups.google.com...] for referencing and link to it in your re-inclusion request.
Google will likely respond only with a canned response but if you are genuine and sincere you can expect recovery near immediately or within a week or two"