Hi on my previous mailserver i used qmail and had it configured with clamav and spamassassin to do all the scanning during the SMTP session is open. so that if a virus oder spam message was detected, the SMTP session could be rejected with a 5xx error, instead of generating a bounce message (to a probably forged from-address). with postfix and ISPconfig i see that the server accepts the mail and does than the processing and if a virus/spam is found, it sends out a bounce. with todays spam-traffic i see that as a problematic approach, because bounces will be sent to "innocent" users. is there a way to configure postfix (with help of ispconfig) to do the scanning and processing during the smtp-session, like described above? thanks for your advice greets KoS
ISPConfig does not send any spam bounces in a default setup. Spam is either deleted without a bounce when its score exceeds spam kill level or it is marked as spam in the header and title if the spam level 2 is matched. If your setup sends bounces, then you must have configure that in amavisd.
thanks, till. sorry for my imprecise question: - spam/virus mails are, as you write, deleted (or marked). i don't like the way of mails "just being deleted" without a notice, as i don't see that as the right way to go. thats exactly the reason why i would like to reject them during the SMTP session, so that the sender is responsible for generating a message to the user (e.g. if the mail was falsely detected as spam/virus), or discarding it, in case of a spam bot. - bounces are generated for non-existing addresses. the mail to a non-existent address (of an existing domain) is accepted by the server and a bounce is sent back to the sender of the address, instead of rejecting the mail at smtp-level. the server was configured by the ispconfig debian (mail) guide. i suppose this is the expected behaviour of an "ispconfig-server"? is there a way to change that? i mean, i'll check the postfix/amavis, but still i'm not sure what's the impact than on ispconfig, or perhaps there is already a "howto" for that combination? greets KoS
so i would like to use the Postfix before-queue content filter feature as described here: http://www.postfix.org/SMTPD_PROXY_README.html the setup that i have now, by following the howtoforge guide, is to use "content_filter", but i would like to change to smtpd_proxy_filter. i haven't found a guide or any information about issues with ispconfig on that. is everbody just using content_filter ? :-( greets KoS
