Hi Andi, On Wed, 14 Feb 2024 22:44:12 +0100, Andi Shyti wrote: > b4 ty failed to send the thank you letter because there are some > addresses that were not accepted > (Kozlowski@xxxxxxxxxxxxxxxxxxxxxxx?) Sorry for the mess, this seems to be a bug in my email client (Claws Mail 4.1.1) when the recipient names are quoted and/or include a comma. Ideally my SMTP server should have rejected the message as invalid, but it tried its best to still process it. I'll report the issue to the Claws Mail developers. -- Jean Delvare SUSE L3 Support