Sendmail log

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Hi all,
this question is about Sendmail, but I hope someone will explain me:
I've this in my logwatch:

-----
Unknown users:

    celmacc@xxxxxx
      from fangio.interac.it [212.183.164.43]    1 time(s).
      from vsmtp4.tin.it [212.216.176.224]    1 time(s).


Relaying denied:
    From [218.79.219.187] to diamondmktg@xxxxxxxxxxx: 1 Times(s)
-----

and in maillog:

-----
Dec 19 09:35:59 cmh sendmail[23385]: hBJ8Zxil023385: <celmacc@xxxxxx>...
User unknown
Dec 19 09:35:59 cmh sendmail[23385]: hBJ8Zxil023385:
from=<parkhotel.pn@xxxxxx>, size=487737, class=0, nrcpts=0, proto=ESMTP,
daemon=MTA, relay=vsmtp4.tin.it [212.216.176.224]

(snip)

Dec 19 10:56:39 cmh sendmail[25855]: hBJ9udil025855: <celmacc@xxxxxx>...
User unknown
Dec 19 10:56:39 cmh sendmail[25855]: hBJ9udil025855:
from=<direzione@xxxxxxxxxxxxx>, size=0, class=0, nrcpts=0, proto=SMTP,
daemon=MTA, relay=fangio.interac.it [212.183.164.43]
-----

Celmacc is not a user in my domain and logwatch is reporting this, but
how should I read the maillog part?
As far as I understand this is a sender log but the number of
receipients is always zero, and in one case the size is zero too. Should
I take any action?
Thanks, Carlo



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