Re: is this an attack on my sendmail?
* Quoting César Augusto Seronni Filho (listas@kernelinformatica.com.br):
> hi guys in my maillog I am receiving many strange message on sendmail like
> that:
> May 10 18:52:50 xserver sendmail[4444]: g4AIRfa02119:
> to=<yourname@company.com.>, ctladdr=<one of my user mail> (638/45),
> delay=03:25:09, xdelay=00:00:00, mailer=esmtp, pri=607606,
> relay=company.com., dsn=4.0.0, stat=Deferred: Connection timed out with
> company.com.
company.com might be down. Sendmail will retry
later.
> look that <one of my user mail> is one registred email with my domain. The
> messages points aways to the same user email.
>
> and the other strange thing is that when i try to check the
> conections(netstat -at) there are one strange like that:
> tcp 0 1 myserver:35169 mywebos.com:smtp SYN_SENT
> when I use netstat -atn looks like that:
> tcp 0 1 myserver:35169 208.49.229.140:25 SYN_SENT
>
> and look that this ip(208.49.229.140.25) is not owned by mywebos.com
>
> I think it is spoofed
Probably a typo:
18:07 rk@afrika:~$ host 208.49.229.140
Name: mywebos.com
Address: 208.49.229.140
> Maybe this is an attack?
Unlikely. The connections origin is your server.
> What i can do?
Lean back.
- Rolf
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