Dynamic IP Blocking
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Dynamic IP Blocking
20-09-2007 9:49 AM
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Re: Dynamic IP Blocking
20-09-2007 9:59 AM
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It's not really clear what you mean by 'all such websites' without knowing how the trusted source's email systems are set up or how their systems are configured. This certainly wouldn't affect everybody with a .co.uk domain name!!
We have basically begun rejecting email that originates from IP addresses that are registered as dynamic or have suspicious rDNS entries. It's important to note that this may also include statically assigned IP addresses that are considered dynamic by the Internet registry responsible for the allocation of such addresses.
http://en.wikipedia.org/wiki/Dynamic_IP#IP_address_allocation
http://www.ripe.net/info/ncc/index.html
If the email is legitimate then the most likely reason for its rejection is the fact that the sender will be attempting to deliver the email from a private smtp mail server instead of through their Internet Service Provider. If this is the case then it is recommended that you contact the sender of the email to ask that they use a 'smart-host' or 'smtp connector' so that emails to your address (or all PlusNet addresses if you do not have your own domain) are sent using their ISPs mail servers instead of from their own IP:-
http://en.wikipedia.org/wiki/Smart_host
If this is not possible and you are confident that the rejected email it genuine and standards compliant then you can forward the bounced message to abuse@plus.net so we can look at the possibility of whitelisting it. Should you do this, it is advised that you includes a bit of background detail explaining what problem is being experienced. You will also need to contain the full headers of the failed delivery notification you received:-
http://www.plus.net/support/email/email_troubleshooting/email_troubleshooting.shtml
Please be aware that you may not receive a dedicated reply from abuse.plus.net although any request will be considered in full and whitelisted where appropriate (whitelisting will prevent these emails from getting rejected):-
http://en.wikipedia.org/wiki/Whitelist#E-mail_whitelists
We expect that most of these rejections will be due to poor configuration of the senders systems in which case the mail is being rejected as it should.
Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
Re: Dynamic IP Blocking
20-09-2007 10:47 AM
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We have a very simple setup. Netgear ADSL router connecting us to the internet which is firewalled and NAT'd up nicely. Behind this we have our three office computers plus a Small Business Server 2003 running Exchange.
Exchange is picking up our emails using the built-in POP connector as we didn't see any need to have emails directly downloaded to us but we have some users anyway who simply use Outlook Express to pick up the occasional email they may be sent on our domain (hosted by PN also).
We're sending emails, on the whole, without problems, but did have two instances yesterday when we received this message about using a dynamic IP address problem. The IP address on our server is manually configured and our PlusNet IP address is statically assigned.
Forgive the naivety but is there something we should do to stop these errors cause we're quite happy with the way everything was working and don't really want to have to change too much if we can help it now we've finally got everything running smoothly.
Re: Dynamic IP Blocking
20-09-2007 11:34 AM
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PlusNet now do the same (block mail from dynamic IPs), so I guess people running their own mail servers may be affected when emailing PlusNet domains.
Unless I've misunderstood.
Re: Dynamic IP Blocking
20-09-2007 12:05 PM
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Quote from: rascom Forgive the naivety but is there something we should do to stop these errors cause we're quite happy with the way everything was working and don't really want to have to change too much if we can help it now we've finally got everything running smoothly.
Hi there,
These bits of my previous reply are of relevance...
Quote It's important to note that this may also include statically assigned IP addresses that are considered dynamic by the Internet registry responsible for the allocation of such addresses.
http://en.wikipedia.org/wiki/Dynamic_IP#IP_address_allocation
http://www.ripe.net/info/ncc/index.html
Basically, your IP can still get rejected even if it is static. Statis IPs that ISPs assign customers are normally asigned by the registry from dynamic address space.
Quote If this is the case then it is recommended that you contact the sender of the email to ask that they use a 'smart-host' or 'smtp connector' so that emails to your address (or all PlusNet addresses if you do not have your own domain) are sent using their ISPs mail servers instead of from their own IP:-
http://en.wikipedia.org/wiki/Smart_host
To get around it the sender would basically configure their email server to send email to our addresses (ie. plus.com, .force9.co.uk etc.) via their ISPs outgoing mailserver.
Quote but did have two instances yesterday when we received this message about using a dynamic IP address problem.
Was this people sending to you or you sending to others? We are only enforcing this on our inbound mail delivery platform. Did the rejection message contain our abuse email address?
Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
Re: Dynamic IP Blocking
20-09-2007 12:24 PM
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The domain we have had problems with is hosted by Fasthosts.
However, the message undelierable message came back to us from PlusNet's mail server with the message about rejecting the email because of dynamic addressing and suggesting we contact the abuse account if we believed this to be in error.
By and large everything else is going ok and we resent the email earlier and it went through but this is probably cause it used a different mail server at PN's end.
Re: Dynamic IP Blocking
20-09-2007 1:15 PM
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Still not too sure what's happened here. Perhaps you could PM me the full headers of the rejected report.
1. You sent an email from a PN hosted domain via relay.plus.net to a Fasthosts hosted domain and received the bounced message back to the PN address?
2. You sent an email from the Fasthosts hosted domain via relay.plus.net to your PN address and received the bounced message back to the Fasthosts address?
3. You sent an email from the Fasthosts hosted domain via a third party or another ISP's mail server and received the bounced message back to the Fasthosts address?
Which (if any) of the above is true in your case. 1 and 2 should not happen AIUI, whereas 3 might.
Bob Pullen
Plusnet Product Team
If I've been helpful then please give thanks ⤵
Re: Dynamic IP Blocking
20-09-2007 4:28 PM
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1. Incoming mail from a customer - a trusted source who uses Zen Internet as their ISP;
2. Test loopback mail sent to myself (from my forwarding domain which has never had these problems before)
all gets bounced by PlusNet, my assessment would be that this measure has been brought in too hastily.
I have no idea yet how many genuine emails I'm losing because people don't understand the bounce message or know how to contact me otherwise. Even if they do understand, what chance do they have of communicating this to their ISP and getting them to change their mail configuration?
Very unhappy.
Re: Dynamic IP Blocking
20-09-2007 4:34 PM
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That is to move my company's email away from Plusnet to an ISP that allows us to email properly. It really does work
Re: Dynamic IP Blocking
20-09-2007 4:43 PM
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If we have the problem again in the near future I will resend. As the mail serevrs are upgraded in turn anyway I suspect we may see this problem more and more as the work pregresses.
Re: Dynamic IP Blocking
20-09-2007 4:56 PM
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Re: Dynamic IP Blocking
20-09-2007 5:08 PM
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Frankly I would rather get all the email sent to us and do the spam filtering myself - CA anti spam work great!
Sorry Free- online but I think you cocked up on this one after giving us 10 years of great service.
Re: Dynamic IP Blocking
20-09-2007 5:15 PM
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Re: Dynamic IP Blocking
20-09-2007 5:17 PM
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http://usertools.plus.net/status/archive/1189789775.htm
Re: Dynamic IP Blocking
20-09-2007 5:31 PM
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It simply is not on to introduce this change and then expect me to tell a client that if he wants to contact me he has to use the FAX.
The are lot of small businesses who don't have dedicated IT staff and we have to bumble along as best they can. the easiest thing probably to change ISP.
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