After the last updates errors with the mail accounts

After the last updates errors with the mail accounts. It seems that when emails are sent they bounce and give an ip error. This happens at 8 vm.

Has anyone detected any of this?

Thank you

There was only a change to roundcube, not to exim itself, can you explain further?

Hello good morning.

The problem is the following:

When a client wants to send me an email, it appears that he is on a blacklist and returns the 550 error or that the email does not exist.

Sometimes it goes in, sometimes it doesn’t… and it’s random.

I paste a header from a return:

[email protected]
Remote Server returned ‘550 5.7.350 Remote server returned message detected as spam → 550 Rejected because is in a black list at;Error: open resolver; DNSBL Error Code - Open/public resolver - The Spamhaus Project