Hi, I already wrote to pharo-users-owner@lists.pharo.org, but don't know how well that is monitored, at least I did not see an effect up to now (it's not been a lot of time, though). The mailing list is using a badly configured server, and that causes mail to be rejected. Host "lists.pharo.org" has IP address 176.58.125.247, and that's the address mails are being sent from. The PTR for that IP address is "prod3.harmonylists.io", which is apparently a name given by the provider. However, the domain registration for harmonylists.io seems to have expired, and the domain grabber who took it now points the domain to IP address 15.197.172.60. Postfix doesn't like that and therefore refuses to accept mail from that IP address. Please, whoever has a contact to either the pharo list maintainers or the mailing list provider, get them to fix this. Cheers, Hans-Martin