logwatch telling me zimbra@domain.com bounced

[Mad Professor]

C1CD9E243FA: to=<zimbra@********.hopto.org>, relay=none, delay=0.2, delays=0.02/0.08/0/0.1, dsn=5.0.0, status=bounced (********.hopto.org)
C1CD9E243FA: sender non-delivery notification: 024F9E243F9
024F9E243F9: to=<zimbra@********.hopto.org>, relay=none, delay=0.06, delays=0.04/0.01/0/0.01, dsn=5.0.0, status=bounced (********.hopto.org)
844EBE243FB: to=<zimbra@********.hopto.org>, relay=none, delay=0.15, delays=0.04/0.06/0/0.06, dsn=5.0.0, status=bounced (********.hopto.org)
844EBE243FB: sender non-delivery notification: ACF61E243FD
ACF61E243FD: to=<zimbra@********.hopto.org>, relay=none, delay=0.05, delays=0.03/0.01/0/0.01, dsn=5.0.0, status=bounced (********.hopto.org)

is this normal for zimbra to be trying to send mail to itself?

Everything seems to be functioning fine on zimbra.
I can sent and receive emails from my accounts, but I always see these messages in the logwatch.

Whats the deal?

[yotake]

I am seeing same bouced error on netwrk edition 5.0.19.
does anyone know what it is and correct responce to it?