Configuring SOA DNS on a Smmall business server 2003

Someone using sendio.com told my client that their ip was corrupt.   So i ran a DNS check with MXTools and it said serial number was out of range (serial number 22524) .  So I started to look for a solution and got more confused.  I tried to change the serial number to 2015070111 because it seemed most people thought that was suppose to be the format. That did not seem to work.   ATT handles our mx records and I do not know if i need to change something on the server or call ATT to fix .
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a52dragonAsked:
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arnoldCommented:
The serial number as you mentioned is only useful to make sure when a change is made, that the subordinate servers will based on the serial number see that it is newer..

It is a preference, and the notice there is merely a suggestion.

Your second image, reflects an ID not reflected on the public record.

You should make sure that your dns is synchronized internally.

Neither of the serial numbers is a concern or an indication of a flaw.
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a52dragonAuthor Commented:
You should make sure that your dns is synchronized internally.  How would I do this ? thank you
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arnoldCommented:
Do you have multipleDNs servers internally, check whether they have the same serial.
Nslookup -q=soa domain dns1?
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a52dragonAuthor Commented:
No just the one running on SBS2003 server   thank you arnold
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arnoldCommented:
The SOA is an informational record only: Who to contact, source of the record, internal serial number, zone and record time tables for expiration.

My guess what the sendio folks are trying to do is sell email filtering, services to your client and you experienced a broken phone issue. What they said might not have been accurately relayed.
They likely meant that the current email handlers are not  as "advanced as their services" in mitigating spam/virus transmission via email, possibly record keeping/archive/compliance, etc.
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