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2139 posts

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Topic # 92886 8-Nov-2011 16:42 Send private message

Hey,

Anyone else having issues sending emails to certain recipients?
We've got a few clients who are having issues sending emails sometimes to some recipients and as far as I can tell it looks like Vodafone / ihug SMTP servers have been put on one or more spam blacklists.

Vodafone can you look in to this please?
As we ourselves aren't a Vodafone customer I can't log a fault and our clients are probably too busy to do it but I have told them to.

Cheers




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  Reply # 542700 8-Nov-2011 16:53 Send private message

It's usually a bad idea to use your ISP's SMTP servers for these kinds of reasons. Probably best if your client's use their email provider's SMTP server.





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  Reply # 542702 8-Nov-2011 16:55 Send private message

Who are they Blacklisted with?






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  Reply # 542703 8-Nov-2011 16:57 Send private message

Our clients have their own Exchange servers so no email provider involved for the incoming emails.
I use the ISP smtp servers as we've had problems in the past just using DNS for outgoing emails.

What do most people do for Exchange servers?






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  Reply # 542704 8-Nov-2011 16:59 Send private message

johnr: Who are they Blacklisted with?


Sorbs and Backscatterer it seems.




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  Reply # 542710 8-Nov-2011 17:09 Send private message

CYaBro: Our clients have their own Exchange servers so no email provider involved for the incoming emails.
I use the ISP smtp servers as we've had problems in the past just using DNS for outgoing emails.

What do most people do for Exchange servers?


If you run your own mail server then use your own SMTP server? You have much better control that way - what kind of DNS problems? 







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  Reply # 542712 8-Nov-2011 17:15 Send private message

Zeon:
CYaBro: Our clients have their own Exchange servers so no email provider involved for the incoming emails.
I use the ISP smtp servers as we've had problems in the past just using DNS for outgoing emails.

What do most people do for Exchange servers?


If you run your own mail server then use your own SMTP server? You have much better control that way - what kind of DNS problems? 


And how do you do that?
I know nothing about SMTP.
These are only small clients who are running Small Business Server 2003/2008/2011.

Exchange generally only gives you two options for outgoing email to be sent by either DNS or to another SMTP server.

Can't remember the DNS issues it was so long ago and I've never bothered to try it again as we haven't had any issues using the ISP smtp servers until the last couple of weeks, with Vodafone anyway.
All our other clients who aren't with Vodafone have never had issues.




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  Reply # 542731 8-Nov-2011 18:02 Send private message

I run my own mail server and I route off TCL, mainly due to certain ISP's blocking email, with Xtra being the worst, as my reverse DNS is different from my sending DNS.

The only way to get things working is to relay off my ISP.



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  Reply # 543060 9-Nov-2011 12:25 Send private message

Any update on this John?




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  Reply # 543150 9-Nov-2011 14:42 Send private message

CYaBro:

And how do you do that?
I know nothing about SMTP.
These are only small clients who are running Small Business Server 2003/2008/2011.

Exchange generally only gives you two options for outgoing email to be sent by either DNS or to another SMTP server.

Can't remember the DNS issues it was so long ago and I've never bothered to try it again as we haven't had any issues using the ISP smtp servers until the last couple of weeks, with Vodafone anyway.
All our other clients who aren't with Vodafone have never had issues.


A lot of mail filtering solutions do a reverse dns lookup on the ip address of the email server the email came from to see if it matches the domain name.

If the clients have a static ip and/or a business grade Internet connection, then usually it's just a matter of requesting a PTR record (reverse dns) be created by the internet provider.

If that's not an option another popular solution is to use a mail gateway service like www.smx.co.nz or Mail Marshall Secure Email gateway, there are heaps of them.

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Vodafone NZ

  Reply # 543154 9-Nov-2011 14:45 Send private message

CYaBro: Any update on this John?


Have you logged a ticket with the fixed line team?

Sorbs and Backscatterer is not run by Vodafone NZ




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  Reply # 543164 9-Nov-2011 15:09 Send private message

If email is important to business, then you should look at third party SMTP services. There are many around, including smtp.com, Amazon, DynDNS and others.

Configure your system to use that, configure proper DNS settings to let the world know the SMTP server being used is related to your domain, and be free of your ISP.






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  Reply # 543200 9-Nov-2011 16:03 Send private message

johnr:
CYaBro: Any update on this John?


Have you logged a ticket with the fixed line team?

Sorbs and Backscatterer is not run by Vodafone NZ


I realise that but they have got the Vodafone mail servers blacklisted so anyone using their lists for SPAM filtering is blocking any email coming from Vodafone.

You guys had this issue last week (as seen on the Vodafone forums and issues with the same clients) and it was resolved but it is back again.
Isn't it up to Vodafone to make sure their mail servers aren't blacklisted?

Not sure if the clients have logged a fault and as I said we can't do it as we aren't a Vodafone broadband customer.




148 posts

Master Geek


  Reply # 543307 9-Nov-2011 20:14 Send private message

Have they got their own domain? Or are they using Vodafone.co.nz or ihug.co.nz?

Is there a register of these blacklisters for the ISP's/mail providers to notify?

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  Reply # 543358 9-Nov-2011 21:39 Send private message

mthand: Is there a register of these blacklisters for the ISP's/mail providers to notify?


We use www.mxtoolbox.com to monitor our sending IP addresses at work. We'll get an email from them if our IP addresses are blacklisted. Seems to do a resonable job of alerting us to problems and they have a free service that will monitor 2 IP addresses.

Their website also has a RBL lookup service that you can use to query multiple blacklists.

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  Reply # 543401 9-Nov-2011 22:53 Send private message

Yep mxtoolbox is great.

Looks like it's not on any major blacklists now
http://www.mxtoolbox.com/SuperTool.aspx?action=blacklist%3a203.109.135.50

Have seen it get blacklisted multiple times in the last year, reported it a few times.. got tired of it so changed my friends business web/email site off Vodafone hosting (he was originally a ihug and quik customer) on to openhost.

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