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<p class=MsoNormal>I have an issue I have been struggling with for some time. I
know this might be a bit off topic here, but figured this would be the best
group to ask as who is more knowledgeable about this kind of stuff than you
guys? <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>When sending emails out they sometimes reach their
destination and sometimes not. We host our emails with a company called XO that
offers a service that checks for SPAM (I’d rather have a Linux setup with
MailScanner etc, but this is what the client wants) and then relays the email
to our Exchange server. When sending out emails they go directly from our
Exchange server to its destination. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>One of the thing I’ve discovered is that the XO email
servers has a clustered server setup and when I use mxoolbox.com to see if the
IPs are blacklisted I find that on many occasions they are listed on RBL
list sometimes as many as 3 and 4 times, but sometimes not at all depending on
which server in the clustered rotation is up at the time. I see this as a
problem, however I am being assured that the domain name that I am sending the
email from has nothing to do with whether or not an email reaches its destination,
but rather the IP address. Naturally I have tested the IP address of our Exchange
server and it is not black listed. So my question is, why would the email reach
its destinations only sometimes unless somehow there is a dnsresolver involved
that is checking the email’s actual domain name as well as the IP address.
I’m thinking that this is actually the case butu I could be wrong.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Anyone have any comments/suggestions on resolving this
issue?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal>~V<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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