Mailcrypt can generate a response block for you. Just type C-c / b in an outgoing mail buffer. That will prompt you for a chain to use, and will insert the response block at point. Note that you can use any chain you want for your response block; it need not be related to the chain you (later) use to remail the message.
If instead you type C-u C-c / b, you will be dropped into a recursive edit of the innermost part of the response block. This text is what you will see at the top of the message when the response block is used. This text is the only way to identify the response block, since it will be used to mail you through anonymous remailers.
You probably won't need to use the C-u feature, since by default
the response block contains the date, `
To' field, and `
field of the message you are composing. However, if you want your
response block to point to a USENET newsgroup instead of your Email
address, you may edit the innermost part of the response block to have a
Newsgroups' line instead of a `
Inserting a response block also updates the `
header field. So, when your recipient replies to your message, the
reply will automatically be addressed properly. This only works if the
last remailer in the chain used to encrypt the message supports
hashmarks (the response block chain doesn't matter). If the last
remailer does not support hashmarks, Mailcrypt will generate an error
when you try to use the chain.
Note that you should insert your response block before you encrypt the message for remailing. Also, see Remailer Security.Remailer Chains Remailer Support Pseudonyms