erc-send-post-hook

erc-send-post-hook is a variable defined in `erc.el'.
Its value is

(erc-make-read-only)

Original value was

• This variable may be risky if used as a file-local variable.

Documentation:
This hook is called just after `erc-send-modify-hook'.
At this point, all modifications from prior hook functions are done.
NOTE: The functions on this hook are called _before_ sending a command
to the server.

This function is called with narrowing, ala `erc-send-modify-hook'.

You can customize this variable.