Can we send c6 in letter of royal mail

A curious question!

C6 is a type of envelope used by Royal Mail, but it's not a specific item that can be sent in a letter. C6 envelopes are a size of envelope that is 124mm x 162mm (4.9in x 6.4in) in size, and they are commonly used for sending standard letters and documents.

If you're asking if you can send a C6 envelope in a letter, the answer is no. A C6 envelope is already a type of envelope, so you wouldn't send it in a letter. Instead, you would use the C6 envelope to send a letter or document to someone.

If you're asking if you can send a letter in a C6 envelope, the answer is yes! You can use a C6 envelope to send a standard letter or document to someone. Just make sure to affix the correct postage and address the envelope correctly.

I hope that clears up any confusion!