Spinning this off from T276959: Creating exceptions for when to send the recurring expiry/fail email as a more snack-sized question. I got the recurring expiry/fail email on April 11 at a personal Yahoo address, and the complete text appears twice, once normally, and then again with visible tags, like:
//<p>Wikipedia exists thanks to contributions from readers like you.</p>
<p>Thank you again for your support of this mission.</p>
<p>https://donate.wikimedia.org</p>
<p>Sincerely,<br>
There is also visible code at the top:
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=utf-8
I had thought this might just be email client weirdness from Yahoo, but we have since seen multiple donors show this from a range of email clients.
946240 - honoria.plus.com
946242 - bigpond.com
947255, 947809 - gmail.com
946560 - btinternet.com
Is there a way to tell whether this is an email client issue, or something to do with code on our end that we could modify? If the latter and it's not a big technical issue, it would be good to adjust the formatting so that donors see the text only once and without code showing.