Re: Strange SMTP sessions with 'helo=<large negative number>' syntax



this has been going on for weeks.

i believe they're all open proxies or spambots.

(some of us use this as an oracle for open proxies.)

On Wed, Dec 28, 2005 at 04:39:14PM -0500, max wrote:
> Hello all,
> I find this inmy logs throughout the day today:
>
> Dec 28 16:35:52 finn postfix/smtpd[13320]: NOQUEUE: reject: RCPT from pcp0012209034pcs.blairblvd.tn.nash.comcast.net[69.245.57.210]: 501 <-1217882552>: Helo command rejected: Invalid name; from=<shuu@xxxxxxxxxxxxxxxxxxxxx> to=<dylanfans-unsubscribe@xxxxxxxxxxxxxxx> proto=SMTP helo=<-1217882552>
>
> Notice that helo section is a negative number (which is why my postfix rejects the message)
> There are about 5 messages a minute at its peak, and this has been going on most of the day today (EST time zone)
> Some of the connecting IP's are listed in various black lists, such as OPM.
>
> Has anyone noticed this as well? Is this a virus or just some new spam tool?
> Some more rejected messages below:
>
> Dec 28 16:37:50 finn postfix/smtpd[34627]: NOQUEUE: reject: RCPT from cpe-66-75-65-130.socal.res.rr.com[66.75.65.130]: 501 <-1218008120>: Helo command rejected: Invalid name; from=<Laudat@xxxxxxxxxxxxxxxxxxxxx> to=<dylanfans-unsubscribe@xxxxxxxxxxxxxxx> proto=SMTP helo=<-1218008120>
>
> Dec 28 16:37:54 finn postfix/smtpd[13320]: NOQUEUE: reject: RCPT from unknown[219.130.49.89]: 554 Service unavailable; Client host [219.130.49.89] blocked using opm.blitzed.org; Open proxy - see http://opm.blitzed.org/219.130.49.89; from=<burkel@xxxxxxxxxxxxxxxxxxxxxx> to=<max@xxxxxxxxxxxxxx> proto=SMTP helo=<-1209697480>
>
> Dec 28 16:38:10 finn postfix/smtpd[34627]: NOQUEUE: reject: RCPT from 194-144-9-218.du.xdsl.is[194.144.9.218]: 501 <-1209697480>: Helo command rejected: Invalid name; from=<brenno@xxxxxxxxxxxxxxxxxxxxxxxx> to=<max@xxxxxxxxxxxxxx> proto=SMTP helo=<-1209697480>
>
> Thanks,
>
> Max



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