Re: Message 252 when VRFYing
Russell Nelson <[EMAIL PROTECTED]> writes: > Well, actually it *could*, under certain conditions. If you don't > have any .qmail-.*default's, you could create a CDB containing all the > valid addresses, which qmail-smtpd could consult after sufficient > patching. However, that still has the problem of giving away your > valid addresses to spammers. And, .qmail-.*default files are *so* > useful. There are situations in which you do want to selectively decline certain RCPT TO:s. Real-life example: corporate firewall relays to internal hosts. User <[EMAIL PROTECTED]> gets popular with the spammers then departs for greener pastures. I still need to accept mail from the Internet for all foo.internal.example.com users and try to relay it to them, but I *know* that mail for bob is going to turn into a bounce-o-gram and end up doublebouncing to me 9 times out of 10. Being able to say "550 Unknown User" in the initial SMTP conversation for that one selected address would save everybody a lot of trouble. What I picture would be a CDB consulted by qmail-smtpd; it would inhale the job of rcpthosts and morercpthosts. For each RCPT address, it would progressively break it down and check for a match, which would contain an instruction "bounce with $MSG" or "accept for relaying". Eg. for <[EMAIL PROTECTED]> it would check [EMAIL PROTECTED], [EMAIL PROTECTED], host.example.com, and then .example.com (followed presumably by .com and "root" lookups, if we get that far, but nothing useful could be configured at the root level). Or we could just check for a user@host record and accept any and all extensions if the user is valid, thereby saving lookup steps. Or the user@host record could say to backup and try extensions if we want to setup such fine-grained control for that user. In the default case, you'd setup a single host.example.com:accept record, but you'd have the option of [EMAIL PROTECTED]:accept, likewise for the other users, and then host.example.com:550_unknown_user. Being able to say "550 moved - try <[EMAIL PROTECTED]>" would be nice too, not that the crap MTAs of the world ever actually tell the user the actual text from the SMTP rejection. BTW, is the possibility of spammers checking for valid users via the RCPT command a real-world problem? If they really cared, they could set up a valid mailer to match their MAIL FROM and analyze the bounce. IMHO weighing that against the other problem of filling your queues with bounces-to-spam and having them all doublebounce into your lap does call for a value judgement here. -- Anthony DeBoer <[EMAIL PROTECTED]>
Re: Message 252 when VRFYing
Timothy L. Mayo writes: > qmail does not and will not support VRFY. Well, actually it *could*, under certain conditions. If you don't have any .qmail-.*default's, you could create a CDB containing all the valid addresses, which qmail-smtpd could consult after sufficient patching. However, that still has the problem of giving away your valid addresses to spammers. And, .qmail-.*default files are *so* useful. -- -russ nelson <[EMAIL PROTECTED]> http://russnelson.com Crynwr sells support for free software | PGPok | "Ask not what your country 521 Pleasant Valley Rd. | +1 315 268 1925 voice | can force other people to Potsdam, NY 13676-3213 | +1 315 268 9201 FAX | do for you..." -Perry M.
Re: Message 252 when VRFYing
qmail does not and will not support VRFY. Find another way to do what you want. VRFY will NOT work. On Wed, 1 Mar 2000, Shera wrote: > Hello, > > I am very new to qmail, I have used sendmail for over 2 years for my > mini-lan. I am having a slight problem, mail is delivered fine, but when I > telnet to port 25 and vrfy user I get the message "252 send some mail, i'll > try my best", Now if I check the RFC this just means that my users arent > found locally but the mail server will try to send the email (I am a self > taught sysadmin so excuse me for any term used improperly) > > In /var/qmail/control/locals I have my qualified domain > also in /var/qmail/control/rcpthosts I have my qualified domain > > My users have there mail going to /$user/Maildir/ > ** note the mail does go there fine > > I have everything running from one computer so directories and user db are > all in the same computer > > Since the mail works fine except for this Message 252 there is no big > problem execpt that I have a program to verify users and it checks the mail > server with vrfy user and right now my program wont work. So how do I fix > it so qmail sees my users as local? > > Thank You, > Shera - Sysadmin Technology Unlimited PR > > > > - Timothy L. Mayo mailto:[EMAIL PROTECTED] Senior Systems Administrator localconnect(sm) http://www.localconnect.net/ The National Business Network Inc. http://www.nb.net/ One Monroeville Center, Suite 850 Monroeville, PA 15146 (412) 810- Phone (412) 810-8886 Fax
Re: Message 252 when VRFYing
On Wed, Mar 01, 2000 at 12:45:19PM -0400, Shera wrote: > Since the mail works fine except for this Message 252 there is no big > problem execpt that I have a program to verify users and it checks the mail > server with vrfy user and right now my program wont work. So how do I fix > it so qmail sees my users as local? qmail-smtpd does not verify local users. This is how it is designed. It always return 252 to clients who attempt to use VRFY, whether the user exists or not. -- See complete headers for more info
Re: Message 252 when VRFYing
Shera <[EMAIL PROTECTED]> wrote: >I am very new to qmail, I have used sendmail for over 2 years for my >mini-lan. I am having a slight problem, mail is delivered fine, but when I >telnet to port 25 and vrfy user I get the message "252 send some mail, i'll >try my best", Now if I check the RFC this just means that my users arent >found locally but the mail server will try to send the email (I am a self >taught sysadmin so excuse me for any term used improperly) qmail doesn't implement VRFY because (1) qmail's modular design makes it impractical, and (2) VRFY makes it easy to validate e-mail addresses and local accounts--information that crackers and spammers like. >Since the mail works fine except for this Message 252 there is no big >problem execpt that I have a program to verify users and it checks the mail >server with vrfy user and right now my program wont work. So how do I fix >it so qmail sees my users as local? I suggest you use another method to verify your users, such as looking in the password file. -Dave
Message 252 when VRFYing
Hello, I am very new to qmail, I have used sendmail for over 2 years for my mini-lan. I am having a slight problem, mail is delivered fine, but when I telnet to port 25 and vrfy user I get the message "252 send some mail, i'll try my best", Now if I check the RFC this just means that my users arent found locally but the mail server will try to send the email (I am a self taught sysadmin so excuse me for any term used improperly) In /var/qmail/control/locals I have my qualified domain also in /var/qmail/control/rcpthosts I have my qualified domain My users have there mail going to /$user/Maildir/ ** note the mail does go there fine I have everything running from one computer so directories and user db are all in the same computer Since the mail works fine except for this Message 252 there is no big problem execpt that I have a program to verify users and it checks the mail server with vrfy user and right now my program wont work. So how do I fix it so qmail sees my users as local? Thank You, Shera - Sysadmin Technology Unlimited PR
