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Dynamic IP Blocking

« Reply #48 on 21/09/2007, 15:43 »
Just thought I'd say that mail is going through fine to and from my domain outwith PlusNet.

Don't see why moonpod should be bouncing though, because from what I can see it's correct? Unless I'm picking up the method of detection wrongly.
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« Reply #49 on 21/09/2007, 15:45 »
I am very disappointed that this measure has been introduced. In the past I have been annoyed when lesser ISPs such as AOL have rejected my mails because I happened to be dialled up on my laptop and using a local SMTP server rather than having to change my smarthost each time I use a different dial up.

Now I am in a situation where I cannot receive mails sent from a server on a BT Internet ADSL connection. It is not simple to use BT's smarthost as it requires authenticated SMTP, which is fiddly to set up with sendmail when not using a 3rd party email client.

I would be extremely pleased if this decision could be reversed. I know that combatting spam is difficult but this is not the right way to do it.

VERY unhappy.
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« Reply #50 on 21/09/2007, 15:46 »
Quote from: itsme on 21/09/2007, 15:43
C:\>nslookup www.moonpad.com

Non-authoritative answer:
Name:    www.moonpad.com
Address:  83.138.187.175

That's not what I recieve back for a dns query of www.moonpad.com, I get the same IP both ways.
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« Reply #51 on 21/09/2007, 15:48 »
Typo on my part moonpod and moonpad.

moonpod does return the same A record as the rDNS. SO it is being rejected because the IP come from a dynamic pool Shocked


Quote from: Fost on 21/09/2007, 15:38
Quote from: itsme on 21/09/2007, 15:27
The CS agent forgot to add the IP address for the

forward dns = "www.moonpod.com" 83.138.187.175
which is a different IP o the reverse

I hope that PN have corrected their rDNS entries as these have been incorrect in the past Wink


Not according to zoneedit: http://www.zoneedit.com/l...r=&forward=Look+it+up

Which matches both www.moonpod.com to 207.36.208.184 both ways.

 Or have I got something wrong?

« Last Edit: 21/09/2007, 15:50 by itsme »

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« Reply #52 on 21/09/2007, 15:54 »
Ahh - was confused there for a bit!

Quote from: itsme on 21/09/2007, 15:48
moonpod does return the same A record as the rDNS. SO it is being rejected because the IP come from a dynamic pool Shocked

Except it isn't - try and find us on any dynamic IP list anywhere. So what is the criteria plusnet are using? Where is their list coming from??
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« Reply #53 on 21/09/2007, 15:56 »
@brippon:

Is this by any chance the reason PlusNet are blocking? (Clutching at straws here to find an answer lol):

Quote
C:\>nslookup www.netserve.co.uk
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Non-authoritative answer:
Name:    www.netserve.co.uk
Address:  195.69.95.150


C:\>nslookup 195.69.95.150
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Name:    cluster1.nsnoc.com
Address:  195.69.95.150


C:\>nslookup cluster1.nsnoc.com
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Non-authoritative answer:
Name:    cluster1.nsnoc.com
Address:  195.69.95.151
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« Reply #54 on 21/09/2007, 15:57 »
Quote from: brippon on 20/09/2007, 18:12

In retrospect, would it not have been better to flag mail with the advice that it came from a dynamic IP address and may therefore be suspect? Given notice of impending change like this, one could then have investigated the potential impact and acted accordingly - like move ISP...
Brian

I didn't realise what I had started! This seems to me a good suggestion: the source who contacted me about this problem is going to send by snail mail the reject details -- his e-mails don't reach me AND his website is hosted by Plus, how's that! Everyone now has good spam and virus filters I think, if not they are sitting ducks.
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« Reply #55 on 21/09/2007, 15:58 »
I have just raised a ticket requesting that PlusNet cease blocking emails from dynamic IP addresses. If you feel strongly about this I suggest you do the same.
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« Reply #56 on 21/09/2007, 16:08 »
I run my own email server so PN's implementation of rDNS and dymanic IP checking does not affect me for incoming emails. However I do have a problem sending emails to AOL and I just found out that I have the same problem sending to Hotmail accounts.

As PN are telling users that they have to contact the sending ISP to correct the RDNS/dynamic IP I will be raising a ticket requesting that PN sort out the problems that their users who run mailservers have with AOL and Hotmail accounts.
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« Reply #57 on 21/09/2007, 16:13 »
Quote
However I do have a problem sending emails to AOL and I just found out that I have the same problem sending to Hotmail accounts.
What problem are you having?
Are you using the Plusnet relay server to sent mail?
Arthur
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« Reply #58 on 21/09/2007, 16:15 »
Quote from: MikeWhitehead on 21/09/2007, 15:56
@brippon:

Is this by any chance the reason PlusNet are blocking? (Clutching at straws here to find an answer lol):


Thanks Mike, I was investigating the same thought when you posted this. I'm coming to the conclusion that the term 'dynamic IP' is confusing. The problem maybe is not being able to resolve name to IP to name and get the same answer. (?)

Maybe in my case it's the mail server:

mx2.nsnoc.com = 195.69.94.45 = svr45.nsnoc.com

or
mydomain.net = 195.69.95.204 = ns0.nsnoc.com

Is it that PlusNet's rules here are well-intended but far too restrictive? Does it takes account of load-balancing clusters?

Whatever, I'm going to follow DC's advice and raise a cease-and-desist ticket.

Brian
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« Reply #59 on 21/09/2007, 16:31 »
Quote from: astarsolutions on 21/09/2007, 16:13
Quote
However I do have a problem sending emails to AOL and I just found out that I have the same problem sending to Hotmail accounts.
What problem are you having?
Are you using the Plusnet relay server to sent mail?

For all emails I use my own server but have to set up rules for AOL and Hotmail to use relay.plus.net. Believe AOL does not recognise my IP as static and currently unsure of Hotmail as their also use SPF which I've just setup. Neither AOL or Hotmail send a bounce message so only found out when I was accuse of not responding to emails.

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« Reply #60 on 21/09/2007, 16:35 »
So your having problems when using the relay server?
Arthur
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« Reply #61 on 21/09/2007, 16:39 »
Quote from: katsikali on 20/09/2007, 09:49
...due to the new implementation of blocking dynamic IP addresses, as reported on the Service Announcement page....

Can't find said announcement.  Could someone please point?
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« Reply #62 on 21/09/2007, 16:40 »
Quote from: MikeWhitehead on 21/09/2007, 15:56
@brippon:

Is this by any chance the reason PlusNet are blocking? (Clutching at straws here to find an answer lol):

Quote
C:\>nslookup www.netserve.co.uk
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Non-authoritative answer:
Name:    www.netserve.co.uk
Address:  195.69.95.150


C:\>nslookup 195.69.95.150
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Name:    cluster1.nsnoc.com
Address:  195.69.95.150


C:\>nslookup cluster1.nsnoc.com
Server:  ptn-cdns02.plus.net
Address:  212.159.6.10

Non-authoritative answer:
Name:    cluster1.nsnoc.com
Address:  195.69.95.151

Actually, Mike, in my case servers 150 and 151 have nothing to do with it. They're a different cluster altogether and not related to mail delivery. However the mail delivery cluster also load balances, so many different machines on separate IPs may be asked to respond to any given request. (And any other sizeable provider will mail cluster).

Whatever the cause, it would help us poor mortals (i.e. salary-paying customers) if PlusNet could have a dialogue with an experienced third party service provider (e.g Netserve) about the ins and outs of IP, DNS settings etc., as I think between them they have much more chance of understanding the real source of this problem - even if they can't agree on the resolution!

Brian

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« Reply #63 on 21/09/2007, 16:54 »
Bob, where have you gone?  Your im icon has disappeared and your email address is now hidden.
I sent you info about my client who is being bounce both by emai l at 11 am and IM (when I got no reply to the email) and I have not had a reply at all. 
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