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Another issue... multiple recipients cause mail to go to wrong server

Printed From: LogSat Software
Category: Spam Filter ISP
Forum Name: Spam Filter ISP Support
Forum Description: General support for Spam Filter ISP
URL: https://www.logsat.com/spamfilter/forums/forum_posts.asp?TID=625
Printed Date: 04 November 2025 at 3:42am


Topic: Another issue... multiple recipients cause mail to go to wrong server
Posted By: Guests
Subject: Another issue... multiple recipients cause mail to go to wrong server
Date Posted: 21 May 2003 at 12:23pm

Inbound messages with multiple recipients are directed to the default server instead of the server in the list for that domain...

Need a fix pretty quick !!!

 

Thanks,

Roy


Replies:
Posted By: LogSat
Date Posted: 21 May 2003 at 1:38pm

Roy,

You are correct on this one, we were able to duplicate it. When there are multiple recipients, the email is forwarded "as-is" to the destination server for the domain of the first recipient. This is because SpamFilter is sending the message as it arrives.

If it arrives as an email with all the recipients specified using multiple RCPT TO, this is how they are delivered, to one destination smtp server with multple RCTP TOs. If it arrives as one separate email for each recipient, SpamFilter will send one single email per recipient to the appropriate (the correct one in this case since there is only one) destination smtp server.

Different SMTP servers can send mail to multiple reicipients in both ways, either with one single transmission specifying multiple RCPT TOs in one session, or as separate sessions each with one RCPT TO. SpamFilter simply duplicates this behavior. Changing it is not going to be easy and simple, but we'll see what we can do.

Roberto Franceschetti
LogSat Software

Posted By: Guests
Date Posted: 21 May 2003 at 3:18pm

Roberto,

This is a show stopper... It is not uncommon for us to have customers with reps using various ISPs across the country trying to email back to their office and CC'ing a number of people.

In our testing any mail coming in with multi RCPT TOs is going the default server REGARDLESS of the domain of any recipiants....

We have had to disabled the software until we can resolve this..... 

 

Roy

Posted By: Guests
Date Posted: 22 May 2003 at 12:46pm

So is this what is happening?

The SMTP-sender then sends a RCPT command identifying a recipient of the mail. If the SMTP-receiver can accept mail for that recipient it responds with an OK reply; if not, it responds with a reply rejecting that recipient and the rest of the message and does not nigotiate the rest of the recipients.

Ok, I know what I typed above is not the case now in reading the posts again but I need a description like the one above to understand this bug and how it may bite my company.

-Gordo

Posted By: LogSat
Date Posted: 22 May 2003 at 1:06pm

I'm not sure if this is the right thread for your topic.

The issue for the "multiple recipients cause mail to go to wrong server" is the following.

You own and manage multiple domains. For some reason, you do not want all incoming email to be forwarded to a single destination server. You want email for domain1.com to be forwarded to smtp1.com, email for domain2.com forwarde to smtp2.com, etc. SpamFilter can do that no problem. But if an incoming email arrives, addressed to mailto:user1@domain1.com" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - user1@domain1.com , and CCd to mailto:user2@domain2.com" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - user2@domain2.com , this email will be forwarded just to smtp1.com, which will have to take care of delivering it to mailto:user2@domain2.com" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - user2@domain2.com .

If you are asking a totally different question, and want to know what happens if the RCPT TO is not allowed, then...

It depends on if quarantine is enabled or not. If it's enabled, the only option is to completely receive the message and then at the end return an error code instead of the 250 OK. If the quarantine is disbled, the the address error reply is sent immediately.

Roberto Franceschetti
LogSat Software

Posted By: Guests
Date Posted: 22 May 2003 at 1:10pm

You answered my question.  I was just having a problem getting my mind around this situation.

 

Thanks

Posted By: Guests
Date Posted: 22 May 2003 at 5:22pm

Roberto...

What you outline is not exactly what we are experiencing... however I do understand what you are saying... about 1 email addressed to multiple users going to different domains, etc....I am sure we are experiencing that as well ...

BUT...

What we are seeing is an email containing addresses all pointing to a SINGLE SMTP server (one domain) being routed automatically to the default smtp server... in effect ignoring the routing listed in the local domain box....

An email addressed to a single user works fine...it routes to the appropriate server...

This is a much bigger issue for us...

Roy

Posted By: LogSat
Date Posted: 22 May 2003 at 7:44pm

I had misunderstood you. We were able to duplicate the problem, and it is definetly a bug. We should be able to fix it within a few hours and hope to release the patch for it tonite.

Roberto Franceschetti
LogSat Software

 

Posted By: Guests
Date Posted: 21 January 2005 at 5:35am
Hi,

Was this ever fixed ?

We are experiencing exactly this problem in version 2.1.2.395

Just to clarify : One incoming email to recipient1@domain1, recipient2@domain2 should be send to smtp1, smtp2 respectively, but are both sent to smtp1, generating a NDR for recipient2

Posted By: LogSat
Date Posted: 21 January 2005 at 10:56pm
Freddie,

This threads deals with 2 issues. The first post by Roy was catalogued as a bug. Roy better described the issue in this subthread: http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=654" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=654

We fixed the issue the same night with build 1.1.2.124. The release notes for that build are as follows:

// New to VersionNumber = '1.1.2.124'; {DONE -cFix : Whitelisted emails blocked if keyword match} {DONE -cFix : The FQDN was not written in the welcome banner} {DONE -cFix : Emails forwarded to default smtp rather than secondary fwding assigned to individual domains if multiple recipients}

The second issue we ourselves brought up in the thread ( http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=632" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=632 ) is that if an email arrives addressed to multiple recipients who are on different domains, and you have custom forwarding rules for some of the domains, SpamFilter may not be able to honor such rules. This is because some emails arrive as a single email with multiple RCPT TO commands. SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change.

Roberto F. LogSat Software

Posted By: Guests
Date Posted: 24 January 2005 at 2:54am
Roberto,

Thanks for you reply. Was this one ever solved ? : http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=632" CLASS="ASPForums" TITLE="WARNING: URL created by poster. - http://www.logsat.com/spamfilter/forums/showmessage.asp?messageID=632

Because that is what we are still experiencing

Posted By: LogSat
Date Posted: 24 January 2005 at 11:34pm
Freddie,

As we mentinoed in the last couple of sentences in our posting on this thread:

>> SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change. >>> SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change. >>> SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change. >> SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change. >> SpamFilter will not "break apart" the email and send multiple copies in multiple batches, one per recipient. This behavior is by design and will probably not change. >>>>

Roberto F. LogSat Software


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