From twisted.mail.smtp import SMTPError

dear all, does anybody ever have the following issue?
do you have any advice? The server was restart and get a new IP. I also try to change the domain. is it possible to change domain?

from twisted.mail.smtp import SMTPError
File “/usr/lib/python3/dist-packages/twisted/mail/”, line 87, in <
DNSNAME = socket.getfqdn()
File “/usr/lib/python3.7/”, line 676, in getfqdn
hostname, aliases, ipaddrs = gethostbyaddr(name)
UnicodeError: encoding with ‘idna’ codec failed (UnicodeError: label too lo
globaleaks.service: Control process exited, code=exited, status=1/FAILURE
globaleaks.service: Failed with result ‘exit-code’.
Failed to start LSB: Start the GlobaLeaks server…