Zimbra message trace

# by sender
/opt/zimbra/libexec/zmmsgtrace -s user@domain.com


# by recipient
/opt/zimbra/libexec/zmmsgtrace -r '@gmail.com'

Apt error Could not get lock /var/lib/apt/lists/lock

  sudo fuser -vik -TERM /var/lib/apt/lists/lock  

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