By design it does not. It rejects the envelope so it saves your bandwidth and puts the stress on the senders server to generate bounces. This also allows many of us to run on sub 1Ghz machines and still do over 50 thousand emails easily.
Example email to IMGATE list today: To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]> Subject: [IMGate] why I hate MS (and love postfix) Date: Thu, 26 Aug 2004 11:09:33 -0400 I've got an IIS4.0 server that has web sites that send email. I run these through one of my imgate servers to filter so people can't use them to spam from our web sites. Normally our mail servers each handle about 10-30k messages/day, not high volume. Here's the fun part. The SMTP server in IIS4 doesn't understand a 'Sender address rejected: Domain not found' reject from postfix, it just tries again, and again. It tried over 1.2 million times yesterday. The thing is, no one noticed anything until I got the report this morning. The pflogsumm, which starts running at 4:00am just got to me at 11:00am - it took that long to process the log file, which was 1.4GB, normally they are a few hundred KB. The zip process is still running after 13 minutes, yet mail continues to flow through. This is a PIII 600Mhz with 256MB of RAM and a plain jane IDE drive, nothing fancy. Normally the load is well under 1.0 but is running around 2.1 for now, yet mail continues to flow normally. Thanks to all who made this possible. -Mitch Planck -----Original Message----- From: Fyodorov, Andrey FTL [mailto:[EMAIL PROTECTED] Sent: Thursday, August 26, 2004 12:56 PM To: Exchange Discussions Subject: RE: spam solutions Does it have a quarantine area where users could see stuff and check if something has been trapped by mistake? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Keith Kikta - iland Internet Solutions Sent: Thursday, August 26, 2004 1:57 PM To: Exchange Discussions Subject: RE: spam solutions IMGATE project (http://imgate.meiway.com/) *BSD/Linux + Postfix + IMGATE config = almost zero administration and users don't know its there except for the drop in spam. Most of the IMGATE project users use FreeBSD but it really works on any OS that can run Postfix. The IMGATE mailing list is very active so its quite easy to get help if you need it. :) Also if you use a *BSD/Linux Postfix outbound server you can speed up your mail delivery... offloading outbound to a "smart host" makes exchange a happy camper. Partial Daily report: Rejects: -------- 1 ETRN Mail theft attempt 1 RBL smtp.dnsbl.sorbs.net 4 RBL web.dnsbl.sorbs.net 4 SMTP Exceeded Hard Error Limit after RSET 8 SMTP Exceeded Hard Error Limit after MAIL 10 SMTP Exceeded Hard Error Limit after CONNECT 16 RBL rhsbl.sorbs.net 17 ACL to_relay_recipients unknown recipient 20 ACL body checks 20 SMTP unauthorized pipelining 23 RBL relays.ordb.org 44 ACL from_senders_clueless 49 MIME mime-error 52 DNS timeout for MTA PTR hostname (forged @sender.domain) 54 RBL opm.blitzed.org 93 ACL to_local_recipients unknown recipient 132 ACL header checks 158 ACL unauthorized relay 184 RBL blackhole.securitysage.com 196 ACL SAV: new verification in progress 299 ACL SAV: undeliverable sender address 470 RBL bl.spamcop.net 504 DNS nxdomain for MTA PTR hostname (forged @sender.domain) 606 RBL sbl.spamhaus.org 659 RBL dul.dnsbl.sorbs.net 1477 RBL cbl.abuseat.org 1699 RBL korea.services.net 1711 RBL dnsbl.njabl.org 2371 RBL list.dsbl.org 2548 ACL SAV: unverifiable sender address 2704 SMTP Exceeded Hard Error Limit after RCPT 3816 RBL block.rhs.mailpolice.com 5919 DNS no A/MX for @sender.domain 8409 SMTP Exceeded Hard Error Limit after DATA 8649 ACL helo_hostnames 42927 TOTAL Postfix log summaries for Aug 20 Grand Totals ------------ messages 7178 received 7035 delivered 2 forwarded 109 deferred (113 deferrals) 129 bounced 31742 rejected (81%) 8629 reject warnings (used for testing new filters, these aren't really rejects) 0 held 0 discarded (0%) 200977k bytes received 222187k bytes delivered 1852 senders 1146 sending hosts/domains 1117 recipients 94 recipient hosts/domains Per-Hour Traffic Summary time received delivered deferred bounced rejected -------------------------------------------------------------------- 0000-0100 122 112 0 6 1593 0100-0200 106 102 0 6 1505 0200-0300 123 114 0 5 1716 0300-0400 115 100 0 20 2014 0400-0500 104 88 0 3 2025 0500-0600 73 65 0 5 1731 0600-0700 72 59 4 5 1566 0700-0800 110 99 0 6 1784 0800-0900 187 169 0 2 1696 0900-1000 310 325 1 5 1419 1000-1100 347 364 2 2 1806 1100-1200 308 282 24 9 1957 1200-1300 339 369 7 4 1719 1300-1400 285 273 0 2 1612 1400-1500 2452 2359 72 7 2536 1500-1600 1142 1215 2 4 1948 1600-1700 231 259 0 5 1597 1700-1800 196 180 0 2 1727 1800-1900 140 136 0 9 1600 1900-2000 97 94 0 1 1444 2000-2100 88 77 0 7 1355 2100-2200 106 93 1 8 1308 2200-2300 79 69 0 1 1561 2300-2400 46 32 0 5 1152 -----Original Message----- From: Steven Dickenson [mailto:[EMAIL PROTECTED] Sent: Thursday, August 26, 2004 11:56 AM To: Exchange Discussions Subject: RE: spam solutions Wohlgemuth, Mike wrote: > just want to find out what people are currently using for anti-spam > solutions and their degree of satisfaction (from administrative and > user aspects ) ... Linux + Exim + Exiscan-ACL + SpamAssassin + ClamAV = happy users and admins. Steven --- Steven Dickenson <[EMAIL PROTECTED]> Computer Network Manager The Key School, Annapolis Maryland _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Web Interface: http://intm-dl.sparklist.com/cgi-bin/lyris.pl?enter=exchange&text_mode=&lang =english To unsubscribe send a blank email to %%email.unsub%% Exchange List admin: [EMAIL PROTECTED] To unsubscribe via postal mail, please contact us at: Jupitermedia Corp. 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