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Sendmail 8.11.6 receiving issues

Posted on 2006-06-13
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Last Modified: 2010-03-19
Can send and receive internally, and can send out externally, but cannot receive any external messages.  
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Question by:theret79
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Expert Comment

by:GaryL810
ID: 16895864
The first thing I would look at is your router/firewall.

Has anything changed there, recently?  Firmware upgrade?  IP address?
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Author Comment

by:theret79
ID: 16895883
we had a firmware upgrade, no change in IP address, I restarted the router and reset it.  This actually happened on Friday I was able to send and receive with no problems then around mid morning external emails stopped, the firmware upgrade and reset all came about because I was trying to fix this problem.  
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Expert Comment

by:GaryL810
ID: 16896223
Make sure port forwarding (Port 25 SMTP) is still set up correctly in your router to point to your Sendmail server (which has a static IP, I presume).

What kind of router is it?
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Author Comment

by:theret79
ID: 16896256
it is a RV082 Linksys and the port forwarding is setup correctly, the only thing I can think of is that my ISP changed something in my config.  I have 2 DNS server IP's does one handle mail sent and the other mail received coming into the server.  If they changed one of these server IP's I figure that will definately be causing me some problems
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Expert Comment

by:GaryL810
ID: 16896358
Ah, yes, the RV series...good routers, IMHO.

Your ISP's DNS servers are just for look ups, so that wouldn't affect your mail server receiving mail.

Does your ISP handle your domain name or did you set it up yourself with a registrar like GoDaddy, Network Solutions, Register.com, etc.?

Perhaps your MX record has gotten munged...



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Author Comment

by:theret79
ID: 16896372
ISP handles it
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Expert Comment

by:GaryL810
ID: 16896392
Okeydoke...give them a shout and ask them to check your MX record setup.  It should be pointing to your external IP address.

That's why I like to set up my own domain names.  Makes this kind of administration a lot easier and if you give your ISP the boot, you don't have to wrestle your domain name from them.

Cheaper, too! :^)

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Author Comment

by:theret79
ID: 16896421
what exactly is an MX record is that where they point incoming transmitions to which ever server.  If that is the case my mail server is 10.0.0.4 and I should just see if that is what they have it pointed to.  Is this correct?
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Expert Comment

by:sgh_aba
ID: 16896514
Go to www.dnsstuff.com and on the left side of the page you can put in your domain name and do a search by MX record.  This will let you clearly know what IP addresses your MX lookup, for said domain, is pointing to.  I would not call the ISP until doing this.

sgh_aba
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Author Comment

by:theret79
ID: 16896546
It says there is no MX record but it found an A record, could this be why I cannot receive external emails?
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Expert Comment

by:sgh_aba
ID: 16896786
Yes.  
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Expert Comment

by:sgh_aba
ID: 16896801
Also, does the A record match the name of your sendmail server and it's IP address?
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Expert Comment

by:sgh_aba
ID: 16896817
At this point, if your ISP in in charge of your domain I would contact them and advise what you saw in dnsstuff...

If your ISP in not in charge then you need to modify this yourself or contact the person(s) who have the authority to modify the dns for your domain.


good luck,

sgh_aba
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Author Comment

by:theret79
ID: 16896938
the A record does not match our IP address.  I will contact the ISP and find out why it doesn't match.  
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Expert Comment

by:GaryL810
ID: 16897053
Hey, thanks for the site, sgh_aba!

One to add to my toolbox...

~Gary
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Author Comment

by:theret79
ID: 16897157
We host our own mail server, is this MX record something I need to add in the register (sendmail) or is it our ISP (Nuvox) who sets this MX record?  Like I said above we only started encountering problems friday and it is only ftp and email receiving.  Thanks
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Accepted Solution

by:
GaryL810 earned 125 total points
ID: 16897187
Your ISP will be the one to make the change.

Note that it will probably take at least 24 hours to propagate throughout the 'net.

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Author Comment

by:theret79
ID: 16897195
Nuvox has done this to us before, changing things and not telling us.  Fun, fun stuff.
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Assisted Solution

by:sgh_aba
sgh_aba earned 125 total points
ID: 16898692
The MX record is a type of DNS record entry.  It stands for Mail Lookup and unless you are an ISP can only be modified either by your ISP or by you accessing their DNS records with permission, such as Network Solution, etc.  A DNS A record refers to a host.  I usually prefer to have at least one A record that points to my mail server as well as the MX lookup records.  For example:

A record    mail.yourdomain.com   66.132.19.12
MX 10       mail.yourdomain.com
MX 20       mail.yourdomain.com

sgh_aba
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