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Sendmail 8.11.6 receiving issues

Can send and receive internally, and can send out externally, but cannot receive any external messages.  
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theret79
Asked:
theret79
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2 Solutions
 
GaryL810Commented:
The first thing I would look at is your router/firewall.

Has anything changed there, recently?  Firmware upgrade?  IP address?
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theret79Author Commented:
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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GaryL810Commented:
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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theret79Author Commented:
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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GaryL810Commented:
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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theret79Author Commented:
ISP handles it
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GaryL810Commented:
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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theret79Author Commented:
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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sgh_abaCommented:
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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theret79Author Commented:
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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sgh_abaCommented:
Yes.  
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sgh_abaCommented:
Also, does the A record match the name of your sendmail server and it's IP address?
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sgh_abaCommented:
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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theret79Author Commented:
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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GaryL810Commented:
Hey, thanks for the site, sgh_aba!

One to add to my toolbox...

~Gary
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theret79Author Commented:
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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GaryL810Commented:
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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theret79Author Commented:
Nuvox has done this to us before, changing things and not telling us.  Fun, fun stuff.
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sgh_abaCommented:
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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