I'm wondering if the bio-mom is voluntarily relinquishing. Could be some reasons for that. Needs to get clean, too broke to make it, may be facing in incarceration and doesn't have any family to take the kiddo, etc.

I'm still not clear on exactly where you are with respect to your homestudy, politicalgal. Do you have an approved study yet? Do you even know anything about this child and whether you might be interested in parenting him or her? Is the bio mom expecting an open adoption (starting with this letter) and are you willing to consider that?

If you write the letter, you certainly don't want to give any information that can identify you, where you live, etc.