According to reports elsewhere, this was an email sent by Jayaram to other doctors when they were trying to sort out their story so that the police would be interested in the case. It isn't clear at what stage the police got hold of this email, but it should clearly have been disclosed to the defence. It wasn't. If it had been, it would, at the very least, have undermined Jayaram's evidence with respect to the baby concerned.
I don't know if Letby is innocent or guilty, but I don't think she should have been convicted on the evidence presented. Things that have emerged since conviction have strengthened my view. Unfortunately, because of the way the Court of Appeal operates, she will struggle to get her convictions overturned. Even if she is completely innocent and manages to get her convictions overturned, her life has been ruined. I doubt she will ever be able to work as a nurse again. There will always be those who believe she is guilty.