To not want to write DCs name and address on the back of the envelope?

[BabyDoge]

We've just written DCs Santa letters. I'm wanting to send them to the address provided by Royal Mail, as you get a response from Santa in the post. I've just had a look on their site and apparently you have to write your child's full name and address on the back of the envelope.
Given all the warnings about safeguarding, surely this isn't a good idea? I made a thread the other day about buying DS a football kit and was warned not to put his name on the back. Surely a letter addressed to Santa with a child's full name and address on the back is even worse?
Has anyone else sent a letter off? Did you put the name and address on the back or would it be enough just to put it inside on the letter itself?

Can you not just not post the letter and not get a reply - or not post the letter and write your own reply to your child? Or post the letter and not get a reply / write your own reply?

Your average postman delivers to between 400 and 600 addresses every day. They sort and process 0s of thousands of items through the sorting offices. The huge mail centres are hugely automated. Everything is dumped out of sacks into machines to be sorted. They barely have time to do more than glance at each one. You don't sound silly, you sound completely irrational. I can't even begin to explain how utterly ridiculous this sounds.
Even if the postman registered that it was a child's letter to santa what do you think will happen? Do you think they will try and groom your child by first class post? Presumably the postman already knows you have children? What exactly is it that you are concerned about?

Oh Lordy 😂