SOLVED Mailing list all of sudden not working

Keano16

Registered
Dec 12, 2020
2
0
1
EUROPE
cPanel Access Level
Reseller Owner
Hello,

We have a small team (<10) people using a mailing list for communication.
Since 10.12.2020. (two days ago) the list is not working. It is accessible through cPanel, but each message sent to mailing list is NOT delivered .
For test I tried inviting new members to the list and the invitation email is not coming.
List archive shows last message from 10.12.2020., and nothing from today or yesterday.

Everything else regarding normal email messaging seems to be working fine!

What to do?