Full Disclosure mailing list archives
RE: Backdoor not recognized by Kaspersky
From: "Matthew C. Beckman" <fulldisclosure () mnbn net>
Date: Thu, 4 Mar 2004 03:14:33 -0600
One ISP here in Israel, has tried to do something about
this.
They block all TCP traffic on port 25 (bi di) except for
there own mail
servers IP
This is happening in the United States as well. Late last month, Charter Communications (*.charter.net), a cable provider, began blocking outbound TCP port 25 (inbound is blocked as well, but that may have been done earlier). Notice wasn't given, or at least it didn't reach any customers I talked to. All outgoing mail from within their network must now go through their own SMTP server. This isn't optimal since their mail is queued and has a 5 meg limit on file attachments. However, simply forwarding TCP port 26 to 25 on the remote servers will take care of that. Charter uses IP-authentication and doesn't restrict/examine the headers that are sent, so you aren't restricted too much. It can be quite a pain for those that check their email with a laptop from multiple locations. At home they can only send via Charter's SMTP server, however, from outside the network, you have no access. This causes quite a mess. This does, however, allow Charter to raise a flag if mass-mailings are being sent out, due to a spammer or worm, and can block it from going out. - Matthew C. Beckman _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.netsys.com/full-disclosure-charter.html
Current thread:
- RE: Backdoor not recognized by Kaspersky, (continued)
- RE: Backdoor not recognized by Kaspersky Rob Rosenberger (Mar 03)
- RE: Backdoor not recognized by Kaspersky Nick FitzGerald (Mar 03)
- RE: Backdoor not recognized by Kaspersky Schmehl, Paul L (Mar 03)
- Re[2]: Backdoor not recognized by Kaspersky Simbabque (Mar 03)
- RE: Backdoor not recognized by Kaspersky Mike Barushok (Mar 03)
- RE: Backdoor not recognized by Kaspersky Larry Seltzer (Mar 03)
- SMTP "authentication" (was: RE: Backdoor not recognized by Kaspersky) Nick FitzGerald (Mar 03)
- SMTP authentication will save the world (was: EXE not recognized in passworded ZIP by Kaspersky) Martin Mačok (Mar 03)
- RE: Backdoor not recognized by Kaspersky Mike Barushok (Mar 03)
- Re: Backdoor not recognized by Kaspersky Lan Guy (Mar 04)
- RE: Backdoor not recognized by Kaspersky Matthew C. Beckman (Mar 04)
- RFC and silent discarding of e-mails (was: Backdoor not recognized by Kaspersky) Martin Mačok (Mar 04)
- Re: RFC and silent discarding of e-mails Luís Bruno (Mar 04)
- Re: RFC and silent discarding of e-mails Martin Mačok (Mar 04)
- Re: RFC and silent discarding of e-mails Luís Bruno (Mar 04)
- RE: Backdoor not recognized by Kaspersky Larry Seltzer (Mar 04)
- RE: Backdoor not recognized by Kaspersky Nick FitzGerald (Mar 04)
- Re: Backdoor not recognized by Kaspersky Valdis . Kletnieks (Mar 04)
- RE: Backdoor not recognized by Kaspersky Sean Crawford (Mar 04)
- Re: Backdoor not recognized by Kaspersky Rodrigo Barbosa (Mar 04)
- RE: Backdoor not recognized by Kaspersky Sean Crawford (Mar 04)