Issue with emails bouncing back

Hi All,

The emails have been working great over the last couple of weeks using virtualmin but today suddenly they have stopped. I get this in my mail log

“Jul 1 13:15:03 server1 postfix/pickup[18805]: 4A7276E093D: uid=0 from=
Jul 1 13:15:03 server1 postfix/cleanup[19038]: 4A7276E093D: message-id=20190701131503.4A7276E093D@server1.domain.uk
Jul 1 13:15:03 server1 postfix/qmgr[18806]: 4A7276E093D: from=root@server1, size=2851, nrcpt=1 (queue active)
Jul 1 13:15:03 server1 postfix/smtp[19040]: 4A7276E093D: to=root@server1, orig_to=, relay=none, delay=0.13, delays=0.08/0.05/0.01/0, dsn=5.4.6, status=bounced (mail for server1 loops back to myself)
Jul 1 13:15:03 server1 postfix/cleanup[19038]: 6B56D6E0945: message-id=20190701131503.6B56D6E0945@server1.domain.uk
Jul 1 13:15:03 server1 postfix/bounce[19041]: 4A7276E093D: sender non-delivery notification: 6B56D6E0945
Jul 1 13:15:03 server1 postfix/qmgr[18806]: 6B56D6E0945: from=<>, size=4774, nrcpt=1 (queue active)
Jul 1 13:15:03 server1 postfix/qmgr[18806]: 4A7276E093D: removed
Jul 1 13:15:03 server1 postfix/smtp[19040]: 6B56D6E0945: to=root@server1, relay=none, delay=0.02, delays=0.01/0.01/0.01/0, dsn=5.4.6, status=bounced (mail for server1 loops back to myself)
Jul 1 13:15:03 server1 postfix/qmgr[18806]: 6B56D6E0945: removed”

my main.cf is as follows:

See /usr/share/postfix/main.cf.dist for a commented, more complete version

Debian specific: Specifying a file name will cause the first

line of that file to be used as the name. The Debian default

is /etc/mailname.

#myorigin = /etc/mailname
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

appending .domain is the MUA’s job.

append_dot_mydomain = no

Uncomment the next line to generate “delayed mail” warnings

#delay_warning_time = 4h
readme_directory = no

See http://www.postfix.org/COMPATIBILITY_README.html – default to 2 on

fresh installs.

compatibility_level = 2

TLS parameters

smtpd_tls_cert_file = /etc/postfix/postfix.cert.pem
smtpd_tls_key_file = /etc/postfix/postfix.key.pem
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for

information on enabling SSL in the smtp client.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = server1.domain.uk
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, server1.domain.uk, localhost.domain.uk, domain.uk , localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
virtual_alias_maps = hash:/etc/postfix/virtual
sender_bcc_maps = hash:/etc/postfix/bcc
mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME
home_mailbox = Maildir/
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination
smtp_tls_security_level = dane
allow_percent_hack = no
smtpd_tls_CAfile = /etc/postfix/postfix.ca.pem
smtpd_tls_security_level = may
milter_default_action = accept
milter_protocol = 2

If anyone could shed some light on this that would be good. I do get the correct response when i dig the mx record.