Letterbox as an adult

[UnderTheNameOfSanders]

Is there a way to continue letterbox as an adult, after timing out of social services?
I was thinking there could maybe be a charity that does it?

DD1 doesn't want to close the door to contact, but doesn't want direct, yet.

Have you asked letterbox if they will continue? It might be worth asking adoption uk for advice also PAC-UK might be able to offer some support, they state they offer intermediary services for adopted adults on their website but not exactly sure what that means.

Depending on the relationship, I have heard other adopters say they've set up a specific and dedicated email address for ongoing indirect contact.

You could in your next letter to mum send her an email address to continue contact (used for solely contact purposes and with clear boundaries in place) to maintain contact as and when your daughter wishes?

Thank you both for those suggestions. I'll chat with DD.