Cannot receive mail

I am trying to setup mail on my VM server.

When sending, some emails are received but others (Gmail.com for example) are having a problem getting through.

When I send a test from Gmail, this is what shows in the logs:

Feb 2 11:03:06 localhost postfix/smtpd[19957]: connect from mail-io1-f51.google.com[209.85.166.51] Feb 2 11:03:07 localhost postfix/smtpd[19957]: lost connection after STARTTLS from mail-io1-f51.google.com[209.85.166.51] Feb 2 11:03:07 localhost postfix/cleanup[22670]: 1C67F492D: message-id=20210202110307.1C67F492D@web60.example.com Feb 2 11:03:07 localhost postfix/qmgr[18611]: 1C67F492D: from=double-bounce@web60.example.com, size=914, nrcpt=1 (queue active) Feb 2 11:03:07 localhost postfix/smtpd[19957]: disconnect from mail-io1-f51.google.com[209.85.166.51] Feb 2 11:03:07 localhost postfix/local[22672]: 1C67F492D: to=root@web60.example.com, orig_to=, relay=local, delay=0.24, delays=0.01/0/0/0.22, dsn=2.0.0, status=sent (delivered to command: /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME) Feb 2 11:03:07 localhost postfix/qmgr[18611]: 1C67F492D: removed