Qmail relaying by bouncing to reply-to
Hi, We've had qmail working splendid for a while, but just got a new problem when the free RBL services were discontinued and there are less sites we refuse based on ip: Apparently, spammers send mails to nonexistent users and rely on qmail bouncing this to the reply-to adress. By setting the reply-to to a suitable adress you get relaying, albeit wrapped in a qmail bounce-message. Now, it is of course possible that we configured everything wrong, so we'll be happy to stand corrected :-) However, as far as I get it, qmail-smtpd never checks for users (like e.g. sendmail that bounces on smtpd-level). I guess we're not the first ones to be hit by this, and it should be specific to qmail, so what should we do? Sincerely, Erik - Erik Lindahl, PhD[EMAIL PROTECTED] Dept. Biophysical Chemistry, Groningen University, THE NETHERLANDS Phone: +31 50 3634335Fax: +31 50 3634800 (You can also reach me as [EMAIL PROTECTED] and [EMAIL PROTECTED]) Hi! I'm a mutated .sig virus! Put me in ~/.signature to multiply me!
Re: Qmail relaying by bouncing to reply-to
On Tue, Jul 31, 2001 at 06:39:45PM +0200, Erik Lindahl wrote: We've had qmail working splendid for a while, but just got a new problem when the free RBL services were discontinued and there are less sites we refuse based on ip: Apparently, spammers send mails to nonexistent users and rely on qmail bouncing this to the reply-to adress. By setting the reply-to to a suitable adress you get relaying, albeit wrapped in a qmail bounce-message. qmail will not bounce anything to a reply-to address; it bounces to the envelope sender. It's not likely that spammers are doing what you say. It's more likely that they think that the address to which they think they're sending spam is valid, but it isn't. I don't know where they get a hold of these bogus addresses. There's a whole slew of spam-only addresses I get mail for; these addresses have never been valid. It really makes no sense to relay mail this way, since a spammer would have to send one message for each spam recipient. If he does this, he might as well just send the mail directly to his victims. Chris PGP signature
Re: Qmail Relaying
On Wed, Jun 20, 2001 at 12:24:11PM +0700, Eko Yulianto wrote: Dear Netter, I use FreeBSD 4.3 Qmail 1.03 Checkpassword and tcpserver. How to make my SMTP cannot access form outside. Right now, I use tcpserver 202.171.1.0,allow,RELAYCLIENT= A typo???^ and I try to relay my SMTP from outside and work. How to block it, so only my user can use this SMTP... It ought to be a '':'' after the adress, i.e.: 202.171.1.0:allow,RELAYCLIENT= There's more information about this in Bernsteins FAQ[1]. Jörgen [1] http://cr.yp.to/qmail/faq/servers.html#authorized-relay
Qmail Relaying
Dear Netter, I use FreeBSD 4.3 Qmail 1.03 Checkpassword and tcpserver. How to make my SMTP cannot access form outside. Right now, I use tcpserver 202.171.1.0,allow,RELAYCLIENT= and I try to relay my SMTP from outside and work. How to block it, so only my user can use this SMTP... Please Help ! Thanks _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com
qmail: relaying
OK.. I've read the relaying and selective relaying docs, but I'm still confused as to what I need to do. Maybe, I have a case of cranial rectitus. (Having ones head up ones A##) I'm setting an ISP that will service upwards of 50,000 to 5,000,000 clients, most of which will be accessing our servers through an Internet Appliance device. How do I provision relaying for these users. They will be connecting to the Internet through their local POP's, with different IP's. Do I need to include of these IP's in the tcp.smtp file, or is there a better way to handle this? - John
qmail relaying
Hello, How do i deny internet ips from using my mail server to email people that isnt in our company, Like [EMAIL PROTECTED] to [EMAIL PROTECTED] using our mail server., i just want the to: to be ourdomain.com,, thanks Jonathan Fortin, Network Administrator [EMAIL PROTECTED] -- Revelex Canada 6830 Park Avenue Suite 209 Montreal,Qc H3N 1W7 business: (514) 274-5120 ext. 228 cellular: (514) 242-7325
Re: qmail relaying
"Jonathan Fortin" [EMAIL PROTECTED] wrote: How do i deny internet ips from using my mail server to email people that isnt in our company, Like [EMAIL PROTECTED] to [EMAIL PROTECTED] using our mail server., i just want the to: to be ourdomain.com,, echo ourdomain.com /var/qmail/control/rcpthosts -Dave
