Hi again, apologies, I can see that my response may have looked abrupt without context:
Here's what I posted on the thread about it when it happened in case you missed it:
JustineMumsnet
We had a temporary glitch with 'Report this post' for a short time today which meant the email of the person reported was included in the report and in a few cases in responses to those reports. This applies to a very small number of users and we'll be contacting them shortly to let them know. Our DPO has been informed and on his advice we'll report it the ICO if appropriate. Please be assured the issue is now fixed. We will of course be examining how it happened to ensure it never happens again. We're really sorry for any concern caused.
An update on this:
We emailed the affected users overnight offering to delete their posts, a retrospective name change or to change their email address. There are around 20 users affected.
The problem was caused by human error our end - our proper processes weren't followed. It started at 12.45pm yesterday and was fixed as soon as we were alerted (around 7pm).
It applied only to the emails/usernames of users who had posts reported (not to those doing the reporting). (Their details were included at the bottom of replies to the person who reported the post)
We know how the error occurred - we obviously have checks and balances in place to stop this kind of thing happening and in two very clear ways the proper procedures weren't followed in this instance.
We'll be reporting ourselves to the ICO today.
Obviously this is deeply disappointing and I understand that people are unnerved. I can assure you we are taking it very seriously internally to learn from it and make sure nothing like this can happen again.
I'm really sorry this has happened and apologise wholeheartedly to all those who've suffered undue concern as a result.