Your clock appears to be fast by the precise number of seconds it took for your post to leave your computer and reach my mail server.
Arrived: Tue, 20 Sep 2022 19:16:05 +0100 (BST) Posted: Tue, 20 Sep 2022 20:16:05 +0200 That's the output of a tiny script that I was just tweaking, that uses sed to extract the times from the first Received: header and the Date: one. I have mutt keys that print the UTC or Local (mine) post time, but was just adding one to measure the transit time for tardy postings. I tested it on a random post (yours—it's short), and was worried for a moment that it was matching the wrong lines. But no, it's your clock. sed -n -e '/^[[:space:]]\+for <.*lionunicorn.co.uk>;/{s/.*; /Arrived: /;p};/^Date: /{s/Date: /Poste\ d: /;p}' for anyone who's wondering. Cheers, David.