In reality, when doing a store & forward there is no DNS resolution. IMail will send the messages to the domain via the IP in the HOSTS file. If it did a lookup and the primary server you are the backup for is down you would end up with a loop (imail sending to itself) hence the HOSTS file lookup.
Eric S ----- Original Message ----- From: "Jeff" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, February 26, 2003 7:17 PM Subject: RE: [IMail Forum] mail not relaying (fixed?) > RTFM, as they say... > > >From the IMail 7.1 manual, regarding "Setting up IMail Server as a Mail > Gateway": > > "The IMail Server host must be able to resolve the domain name to > the IP address of the other SMTP server. This is accomplished by > making an entry for the domain name and IP in the hosts file > (\winnt\system32\drivers\etc\hosts) on the IMail Server host." > > The MX record for the problematic domains was set to the IP address of the > final destination server. The HOSTS file didn't have that IP address in it. > So, Imail checks the HOSTS file first, finds nothing, then does the MX > lookup, wasn't happy, so it tried to use the TCP Stack, and I got Stack > errors. > > Thanks for all the support, > > -Jeff > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Jeff > Sent: Wednesday, February 26, 2003 7:00 PM > To: [EMAIL PROTECTED] > Subject: RE: [IMail Forum] mail not relaying (fixed?) > > > In the HOSTS file on the old mail server, there were IP/domain entries for > the sites that mail is relayed for. On the new DNS/Mail server, there was > only localhost, so I copied from one to the other the relevant sites, and > mail is sending out fine now. Very cool. > > Support at ipswitch, however, seems to consider what I did a hack. This is > all extremely new to me (Sys admin left the company, the backup took another > position, so this is my trial by fire...IMail, DNS, IIS, all of it), so I > honestly don't know. If we take on a company for hosting, and they just > want us to relay mail to them, is it incumbent on me to add to that HOSTS > file, or are the additions made through another route? The 'backup' sys > admin who took another position wants to do a complete reinstall of IMail, > believing that we have a corrupt install. Right now, everyone is getting > mail, so I'm not interested. > > I would really appreciate feedback on the fix/hack/other that I used, and > whether it's good practice or not. > > Many thanks, > > -Jeff > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of R. Scott Perry > Sent: Wednesday, February 26, 2003 12:20 PM > To: [EMAIL PROTECTED] > Subject: Re: [IMail Forum] mail not relaying > > > > >If IMAIL handles mail for the domain, > >everything works fine. The problem is, mail that relays to an outside > >server isn't working. > > It sounds like your DNS server either isn't set up to allow recursive DNS > lookups, or isn't allowing the IP of the IMail server to perform recursive > DNS lookups. That would explain the problem, as it would return MX records > that it has stored locally, but not ones stored on other DNS servers. > > >Mail is originating from IP 209.251.142.17 (where the DNS for this site > >resolved currently), and then tries to send out through the new DNS server > >(209.208.51.130). > > If you have IMail and DNS on the same server, you'll want to change that to > 127.0.0.1 (localhost). That way, you don't have to worry about any > potential routing issues, which are common when trying to route E-mail from > a server to itself. > > >We did this, trying 209.208.51.130, then 127.0.0.1, and neither work. > > What happens when you do the following: > > nslookup > server 127.0.0.1 > set type=mx > hotmail.com > > Does it give the MX records for Hotmail, or a "Refused" or similar response? > > >Any mail that doesn't relay to an outside server is sending/receiving mail > >correctly, it's just those that relay. Naturally, this includes our client > >with the largest mail volume. > > Ah, so the problem is *incoming* E-mail to domains that IMail handles > (relays), but does not store locally (and all outgoing E-mail and incoming > E-mail to locally hosted domains is fine)? That is a different issue. > > In this case, IMail does correctly go to the HOSTS file -- that is by > design, and just how IMail works. > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers. > Declude Virus: Catches both viruses and vulnerabilities in E-mail, with no > annual licensing fees. > > --- > [This E-mail was scanned for viruses by Declude Virus > (http://www.declude.com)] > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
