[ExchangeList] Re: use dynamic ip address for mail server

  • From: "John T \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 3 Oct 2006 23:09:50 -0700

If you already knew that, you would have already known the answers we
provided and would not have had to ask.

 

John T

eServices For You

 

"Seek, and ye shall find!"

 

-----Original Message-----
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Ara Avvali
Sent: Tuesday, October 03, 2006 2:16 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: use dynamic ip address for mail server

 

1.      Yes I got that. Dynamic IP is more trouble than I thought. Client is
already convinced that this is not a good idea
2.      got that too
3.      The question had nothing to do with the quality of firewall or anti
spam solution. Don't mix things up
4.      I know that already

 

  _____  

From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of John T (Lists)
Sent: Tuesday, October 03, 2006 2:02 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: use dynamic ip address for mail server
Importance: High

 

http://www.dnsreport.com/tools/dnsreport.ch?domain=Faranheit.com

 

1. As some one else has posted, you MUST have a correct REVDNS record for
the IP address. This means you have to have a static IP address. If you can
not afford a static IP address, you should look into using a 3rd party as
your MX gateway. Many anti-spam filter systems will add weight to a REVDNS
that is a plain Jane DSL or cable REVDNS record so even if your dynamic IP
has a REVDNS, it will be considered correct and it will show that it is
dynamic and it will be counted against you.

 

2. CNAME's are not allowed when it comes to email servers! Period. End of
story.

 

3. A Linksys router is not a firewall no matter who tells you what. You must
have a properly configured firewall in front of your email server or it will
be hacked and/or used for reverse DOS attacks and/or flooded with incoming
spam and virus laden email and/or subject to DOS attacks.

 

4. Bringing up an email server on the internet is no light subject and must
be handled with extreme caution and due diligence in both configuration and
protection.

 

My recommendation, truthfully: Contact a third party to be your MX gateway
and only except email from that company and even better only send outgoing
email through that company by way of smart host configuration.

 

Yes, I provide those services but I do not care so much as who you use but
rather use some one as your gateway.

 

John T

eServices For You

 

"Seek, and ye shall find!"

 

-----Original Message-----
From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Ara Avvali
Sent: Tuesday, October 03, 2006 11:39 AM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: use dynamic ip address for mail server

 

Faranheit.com

 

  _____  

From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Howard Rappaport
Sent: Tuesday, October 03, 2006 11:35 AM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] Re: use dynamic ip address for mail server

 

Should work; what is the domain?

 

From: exchangelist-bounce@xxxxxxxxxxxxx
[mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Ara Avvali
Sent: Tuesday, October 03, 2006 2:22 PM
To: exchangelist@xxxxxxxxxxxxx
Subject: [ExchangeList] use dynamic ip address for mail server

 

Greetings,

 

We want to host a mail server at a DSL line which is dynamic. Getting static
will cost a lot of money at the location so we got a linksys router that
support dyndns.org and created a record for domain.dyndns.org. Put the
router in front of mail server and forwarded tcp 25 to mail server. Then we
create a CNAME in DNS server that mail.domain.com points to
domain.dyndns.org. Then there is an MX record with 10 priority
mail.domain.com.

Would this work? It is almost 24 hours and dnsreport still says there is no
proper mx record configured. 

I appreciate any help on this one

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