metamatic
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Problems caused by our ISP being on a DNS blacklist
We run Exchange 2003 in our organisation. Our ISP is Demon.
Today I have been receiving emails bounced back to me with text similar to the following:
554 Fasthosts is not accepting mail from [ Client host ; 194.217.242.91 ] at this time. Please contact abuse@fasthosts.co.uk quoting this full error message. dnsbl.sorbs.net;
If i do a lookup on 194.217.242.91 it comes back as anchor-post-33.mail.demon.
I have contacted Demon to get them to try and remove the mail server from the blacklist but in practice I know this can take several days.
I just wondered if anybody else has had the same problem with their ISP getting blacklisted and whether there is anyway round it. For example, can my exchange server act as an SMTP server in it's own right or do i need to send through Demon? In my ESM I have a connector called ADSL which forwards all mail to post.demon.co.uk. Do i need to use this?
Today I have been receiving emails bounced back to me with text similar to the following:
554 Fasthosts is not accepting mail from [ Client host ; 194.217.242.91 ] at this time. Please contact abuse@fasthosts.co.uk quoting this full error message. dnsbl.sorbs.net;
If i do a lookup on 194.217.242.91 it comes back as anchor-post-33.mail.demon.
I have contacted Demon to get them to try and remove the mail server from the blacklist but in practice I know this can take several days.
I just wondered if anybody else has had the same problem with their ISP getting blacklisted and whether there is anyway round it. For example, can my exchange server act as an SMTP server in it's own right or do i need to send through Demon? In my ESM I have a connector called ADSL which forwards all mail to post.demon.co.uk. Do i need to use this?
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Stacy Spear
Note that a small percentage of servers are misconfigured (well a lot are misconfigured) and won't accept connections on 587.
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Thanks for the replies. Demon responded to my email saying they had sorted out the issue which had caused them to be blacklisted but that SORBS wouldn't take them off the blacklist because they weren't prepared to meet SORBS demands to implement real time outbound spam filtering or make a donation to charity.
Anyway, in the last few days I've not had any emails blocked so I assume both parties have come to some sort of arrangement.
Simon - I have no love for Demon and intend to move away from them at some point. I hear good things about Zen Internet. Do you have any opinons on them or can you recommend any other UK ISP?
Also, can any of you recommend a knowledge base article or guide to moving over from a Smathost to sending direct from Exchange?
Anyway, in the last few days I've not had any emails blocked so I assume both parties have come to some sort of arrangement.
Simon - I have no love for Demon and intend to move away from them at some point. I hear good things about Zen Internet. Do you have any opinons on them or can you recommend any other UK ISP?
Also, can any of you recommend a knowledge base article or guide to moving over from a Smathost to sending direct from Exchange?
My primary choice for ISP in the UK is Pipex. The second is Eclipse.
I would suggest that you spend some time on http://www.thinkbroadband.com/ (previously known as adslguide.org.uk) as that will help you make the decision.
I haven't use Zen personally so cannot comment on their performance. What you need is an ISP that will give you at least one (preferably a few) static IP addresses, will set a reverse DNS and doesn't block port 25.
To change the delivery from smart host to direct, simply adjust the SMTP Connector in ESM. It is a radio button to switch between the two.
Simon.
I would suggest that you spend some time on http://www.thinkbroadband.com/ (previously known as adslguide.org.uk) as that will help you make the decision.
I haven't use Zen personally so cannot comment on their performance. What you need is an ISP that will give you at least one (preferably a few) static IP addresses, will set a reverse DNS and doesn't block port 25.
To change the delivery from smart host to direct, simply adjust the SMTP Connector in ESM. It is a radio button to switch between the two.
Simon.