So all three of those look fine in my desktop clients but rubbish in Roundcube. As far as I can tell, it’s Mailman itself doing the conversion of non-ASCII characters to hex codes. At least, the HTML-to-text programs I’ve tried work exactly as expected when invoked with UTF-8 input from the command line. Mailman’s documentation is quite sparse on the subject of character sets, but as far as I can see, English lists are assumed to be encoded with us-ascii, and the way to change this is not documented. For now, I’ve switched off HTML-to-plaintext conversion for this list. Ælfred From: Lochac Masonry Deputy via Selenetest Sent: Wednesday, 16 March 2022 2:03 PM To: nico--- via Selenetest Subject: [Selenetest] Re: Testing HTML-to-plaintext withlanguage.en.charset=utf8 And one last test with charset=iso-8859-1 From: Ælfred se leof via Selenetest Sent: Wednesday, 16 March 2022 1:53 PM To: nico--- via Selenetest Subject: [Selenetest] Re: Testing HTML-to-plaintext with language.en.charset=utf8 And back again with charset=utf-8 ------ Original Message ------ From: "Lochac Masonry Deputy via Selenetest" To: "nico--- via Selenetest" Sent: 16/03/2022 1:37:01 PM Subject: [Selenetest] Testing HTML-to-plaintext with language.en.charset=utf8

A non-ASCII character: Æ

“Smart” quotes and ‘apostrhophes’