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Clients on same subnet as me can't get email from me.

I'm a noob, so forgive any errors in terminology.

I've noticed a pattern. It seems like our A records are all on the same subnet of 64.129.12.xx. Please note: we are not in the same company -- we just send emails to each other. The only coincidence is our IP addresses. This problem only happens with clients on the same IP address pattern.

I can send email to them. They can't send to me. My mail server log says: Winsock Error 10054 Connection was reset by the other side!

My domain name is rnsha.com. Does nslookup provide a clue?

Do you need more info?

Please help!

SOLUTION

BCipollone

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rjpilcher

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NVIT

ASKER

Hey guys. Thanks for your responses. I appreciate it.

We have a sonicwall soho.

Can you clue me in or do you know what settings I should check?

SOLUTION

rjpilcher

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NVIT

ASKER

rjpilcher,

Here's what I've done so far...

Here's my email server log snippet when the client tries to send to us:
Fri 2011-03-18 09:47:59: Accepting SMTP connection from [64.129.12.191:26318] to [0.0.0.0:25]
Fri 2011-03-18 09:47:59: Performing PTR lookup (191.12.129.64.IN-ADDR.ARPA)
Fri 2011-03-18 09:48:00: * D=191.12.129.64.IN-ADDR.ARPA TTL=(1440) PTR=[email.castle-cooke.com]
Fri 2011-03-18 09:48:00: * Gathering A records...
Fri 2011-03-18 09:48:00: * D=email.castle-cooke.com TTL=(1440) A=[64.129.12.191]
Fri 2011-03-18 09:48:00: ---- End PTR results
Fri 2011-03-18 09:48:00: --> 220-rnsha.com ESMTP MDaemon 11.0.1; Fri, 18 Mar 2011 09:48:00 -1000
Fri 2011-03-18 09:48:00: --> 220 All transactions and IP addresses are logged.
Fri 2011-03-18 09:48:00: * Winsock Error 10054 Connection was reset by the other side!

On our mail server, I use nslookup:
> set type=mx
> castle-cooke.com
Non-authoritative answer: castle-cooke.com MX preference = 10, mail exchanger = mail.castle-cooke.com

Question:
Why does nslookup return a different name, i.e. mail.castle-cooke.com vs. my mail server log, i.e. email.castle-cooke.com?

For the blacklist at mxtoolbox.com:
64.129.12.191 (email.castle-cooke.com) is good. Do timeouts count?
64.129.12.85 (rnsha.com - my company) is good.

For mask settings:
I checked my SOHO for any IP patterns w/ 64.129.12.*, but couldn't find any.

What else should I check?

NVIT

ASKER

I forgot to add to my last post...

Telnet:
I telnetted locally from the mail server, and from a workstation on the same subnet.
Both results in:

telnet email.castle-cooke.com 25
takes awhile to respond. Then says: Connecting To email.castle-cooke.com...Could not open connection to the host, on port 25: Connect failed

telnet mail.castle-cooke.com 25
responds quickly. Then says: Connecting To email.castle-cooke.com...Could not open connection to the host, on port 25: Connect failed

NVIT

ASKER

*** Off topic
Is there a way to edit a post I make?