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Exchange and DDNS? Possible?


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#16 sc302

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Posted 28 January 2013 - 14:05

receiving you will be fine, it is always the sending. Many isps have closed out bound port 25 traffic outside of their network when on their dynamic ip network. Many spam filters have excluded dynamic range from being able to get through. How do you get around the world denying you?

The option would be to send through a mail host, you can use your isp mail host, but they may have a sending limit.


#17 umaki

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Posted 28 January 2013 - 14:34

receiving you will be fine, it is always the sending. Many isps have closed out bound port 25 traffic outside of their network when on their dynamic ip network. Many spam filters have excluded dynamic range from being able to get through. How do you get around the world denying you?

The option would be to send through a mail host, you can use your isp mail host, but they may have a sending limit.

Using my ISP Mail Host is a great idea. I don't mind if they have sending limit. Do I only require to get the SMTP for the ISP? or what else info is required?

#18 +BudMan

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Posted 28 January 2013 - 14:37

yeah sure there are lots of people that provide FREE email servers for you to send your mail through :rolleyes:

If you want/need to send email - then you have to be ready to show your not some random box on the net sending spam. No business that needs to use email is going to be on a dynamic IP. Your also going to be able to setup a PTR because again your not a on dynamic IP and your ISP provides you the ability to change the name the IP resolves too. Only the owning ISP can do this, arin controls who where netblocks point for dns here in the US, other parts of the world would be other orgs, lacnic, ripe, apnic, afrinic

Shoot more and more companies are giving up on running their own mail and doing it in the cloud themselves - not even running their own email servers any more. Or contract out companies to be the front man to their exchange boxes - where this other network sends and recv the mail, and exchange gets mail from this company, and sends all email through them "smart host"

Here is the thing - running your own email server on a home connection for anything other than a hobby or for you to get mail from to some bs domain that gets a couple of mails a day and sends a few a day through your isp email server is nothing more than an exercise in futility.

More likely than not your prob just going to end up running a spam machine anyway ;)

edit: What version of exchange are you running? Look up how to setup smarthost. Keep in mind that many isp will not allow you to send mail from other than your email address, ie say account is user@isp.tld -- many will not allow you to send mail through their servers that say the email is from billy@otherdomain.tld

#19 sc302

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Posted 28 January 2013 - 14:37

SMTP you will need as well as your account info to be able to authenticate and send mail through. You will need to send mail as this account though...the mail header needs to show this for your recipients to be able to receive mail. Unless they just do a ip check (which may be the case), but if they do any sort of resolve and the ip doesn't match the header host it won't make it through. There is a lot that goes on to verify authenticity of the sender in a spam filter.

#20 umaki

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Posted 28 January 2013 - 19:14

edit: What version of exchange are you running? Look up how to setup smarthost. Keep in mind that many isp will not allow you to send mail from other than your email address, ie say account is user@isp.tld -- many will not allow you to send mail through their servers that say the email is from billy@otherdomain.tld


am using Exchange Server 2013 over Windows server 2008 R2 (which is a DC as well). My ISP is Saudi Net (worst ISP in the entire middle east with no support at all). Cant even request for PTR. Tried the SMTP for them but still not working, maybe am not configuring Exchange Server properly.


SMTP you will need as well as your account info to be able to authenticate and send mail through. You will need to send mail as this account though...the mail header needs to show this for your recipients to be able to receive mail. Unless they just do a ip check (which may be the case), but if they do any sort of resolve and the ip doesn't match the header host it won't make it through. There is a lot that goes on to verify authenticity of the sender in a spam filter.

I tried tons of ways but none work. Web Server was way easy configuring compared to exchange server :/

#21 +BudMan

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Posted 28 January 2013 - 19:27

"Cant even request for PTR."

I don't know of any ISP that would setup PTR of a dynamic IP other than the generic ones you get.. For example

;; QUESTION SECTION:
;xx.xx.13.24.in-addr.arpa. IN PTR

;; ANSWER SECTION:
xx.xx.13.24.in-addr.arpa. 7200 IN PTR c-24-13-xx-xx.hsd1.il.comcast.net.

Now such a PTR might meet some filtering some domains do in the sense that it exists.. Others might reject it because its not a true reflection of the forward name.. So for example if your mail server IP is resolved via smtp.somedomain.tld, they might like the PTR of the IP that resolves to to reflect the same smtp.somedomain.tld

As I already mentioned, some ISPs won't allow their smtp servers to send mail for anything other than the account holder email address. So if your email address with your isp is umaki@isp.com and your trying to send email from umaki@otherdomain.tld - even if you auth with your specific account info, their server might tell you to get lost since the email address is not valid for that account.

Many ISPs don't even allow outbound on 25 from their dynamic client networks, nor allow their smtp server to send email for any other email address then what is listed on the specific account - this is to help reduce spam being sent from their network. If you have such restrictions then your only solution is to pay for a smarthost that allows you to send mail they forward on your behalf on a different port, etc. The dyndns company already mentioned provides such solutions. If you not willing to pay for such services - how are you affording exchange? ;)

#22 umaki

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Posted 28 January 2013 - 19:48

If you not willing to pay for such services - how are you affording exchange? ;)

I can afford all the services, but I wanted to setup it for free at all. By the way, setting up all this was a part of my exercise. Wanted to learn about the Web hosting, Domain Controller, Email exchange. All was setup properly except this Exchange. I tried adding the PTR host in Zerigo (my Dynamic DNS service) it was done but my ISP really need to assign me a PTR record to my IP (which seems not possible for Dynamic IP Users). How about if I search for some free SmartHost providers before paying for something :rofl:

Edit: by the way, I get free license for Microsoft Products :D so trying all of them is not that bad :rolleyes:

#23 +BudMan

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Posted 28 January 2013 - 20:13

Your not going to find a FREE smart host.. Not that I can think of - I don't even think google apps when it was free for your domains allowed that?

What would the smarthost get out of it? Other than prob blacklisted because you were using them to send spam ;)

You can study the setup of exchange without really having to send mail to all the major players.. Does your isp allow outbound of their network on 25? Simple enough to test, try connecting to a smtp server somewhere?

Cheap way you could do it is get yourself a VPS somewhere... I have a vps for $15 a year that would be more than capable of sending email for me, etc. And I can setup the PTR on the IP the host gave me. So it can be done for very cheap.

But again if all your doing is playing/learning does not matter if the major players will block you.. there are plenty of domains you can send to for testing that wont filter you.

So telnet to a smtp server on 25, can you connect - if so then your isp allows you to send outbound on 25 and could setup exchange to directly send.. Just some of the major players are not going to accept mail from you.

budman@ubuntu:~$ telnet mailin-01.mx.aol.com 25
Trying 205.188.159.42...
Connected to mailin-01.mx.aol.com.
Escape character is '^]'.
554- (RTR:DU) http://postmaster.in...s/554rtrdu.html
554 Connecting IP: 24.13.xx.xx
Connection closed by foreign host.

so you see my ISP allows me outbound on 25, but mail server for AOL told me to get lost ;) Because

54 RTR:DUSpamhaus PBL to block mail from dynamic and residential IP addresses. Per our E-mail Guidelines, we do not accept mail from such addresses. If you believe your IP is listed in error, please contact your ISP directly and have them update their listing with the PBL. If...
  • your ISP reports that the IP is correctly listed in the PBL, and that you should be able to send mail from it, or
  • you were recently assigned IPs, have changed the rDNS on them, and allowed 48-72 hours for propagation time...and you are still getting the error, please open a support request.


    #24 umaki

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    Posted 29 January 2013 - 05:58

    Cheap way you could do it is get yourself a VPS somewhere... I have a vps for $15 a year that would be more than capable of sending email for me, etc. And I can setup the PTR on the IP the host gave me. So it can be done for very cheap.


    Where? can I get that too?

    Will post the telnet results once I get the exact SMTP for the ISP :wacko:

    #25 +BudMan

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    Posted 29 January 2013 - 12:17

    smtp for the isp? Just do a dns look for any smtp server for any domain. Use aol for an example

    As to a vps -- here are some listings of cheap ones

    http://www.lowendbox.com/
    http://lowendstock.com/

    Mine is with http://buyvm.net/

    #26 ITFiend

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    Posted 30 January 2013 - 22:14

    im wondering if i can have exchange emails with ddns. such as have my own exchange server and my own ddns fqdn such as test.no-ip.org and then have

    email1@test.no-ip.org
    email2@test.no-ip.org

    etc etc. tahnk u


    To work around ISP or DHCP issues, you need to purchase a solution. This is what you need:

    http://www.noip.com/...25_unblock.html


    They provide you a level of resilience from bounced mails, as their SMTP servers are going to be more highly available than what you'll be able to build from home and can cache for your Exchange by up to 7 days.