Server and System Status

We have become aware that server NC027 has again been placed in the private block list of a major email provider. About three weeks ago Yahoo blocked this mail server for no good reason — and refused to reveal the nature and source of the alleged complaints that they received — and now Hotmail/Outlook.com has done the same. This means that all email to various Hotmail domains (including outlook.com) is being bounced immediately. Here is what the bounce message looks like for the hypothetical email address example@hotmail.com:

<example@hotmail.com>: host mx1.hotmail.com[207.46.8.167] said: 550 SC-001
    (BAY004-MC5F27) Unfortunately, messages from 212.71.255.195 weren't sent.
    Please contact your Internet service provider since part of their network
    is on our block list. You can also refer your provider to
    http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL
    FROM command)

This mail server’s IP address is — as usual — NOT in the major block lists / blacklists, all of which can be checked using a website like MXToolBox. This service checks 105 known blacklists, and we are listed in exactly 0 (zero) of them.

I will echo the advice that we posted during the Yahoo problem: If you’re forwarding email from your domain to a Hotmail account, we strongly suggest that you stop doing that. If you’re doing that or using personal, free accounts for business use on Hotmail or other free email providers, we also strongly suggest you stop doing that. If you need help achieving — with your own domain and the hosting services you’re already paying for — what you’re currently doing with free email accounts with third-party providers, talk to us and we’ll help you do it a better way.

Additionally, if you’re running a mailing list by blind-copying (or, even worse, simply cc’ing!) any more than about a dozen email addresses (of close friends or family), we suspect that this may be the cause of the recent problems. Within the next 30 days we will be implementing limits on the number of email addresses that can be cc’d or bcc’d in a single message. If you’re doing this, please contact us for options to ensure that your mailing list can continue to operate.

We are attempting to resolve this issue with Microsoft and will post updates here. Thanks for your patience.

Currently email to Yahoo domains is getting through. We are closely monitoring this situation, but only expect to provide major updates from this point forwards.

Thank-you again for your patience with this issue.

Yahoo finally replied to our request for information about why they are blocking us by providing a canned response which didn’t tell us anything we didn’t already read on their website. But they did apologise: “I want to apologize for any inconvenience this issue has caused you.”

Shortly after 01:30 UTC on 31 March we did see all emails still queued on our server for addresses on Yahoo and Yahoo-hosted domains clear — i.e., they were delivered. However, a few hours after that the block at Yahoo based on “user complaints” seems to have been reinstated, and so we are back to square one.

We have again written to Yahoo and are continuing to research possible workarounds … while we wait another day or two for their possible response.

In addition to researching workarounds, we’re taking some of Yahoo’s reasonable advice from their canned email and moving up certain changes to mail server configuration policies that they suggest. However, these cannot be implemented overnight across all clients’ domains without causing even more problems for our clients, so they will be introduced gradually.

We sincerely apologise for this inconvenience, but we cannot take responsibility for Draconian policies implemented at a very large email provider that has drastic effects on small hosting companies like NinerNet and our clients, and that are seemingly out of step with comparable large email providers like Gmail, Hotmail, AOL, etc. We’ve been in business for two decades — only two years less than Yahoo — and are not an upstart spamming operation that opened business last night and will be gone by next week. Clearly this kind of information is not being taken into account by Yahoo.

This is yet another example of why — on a network that requires cooperation between disparate entities, which is the very definition of the Internet — we shouldn’t do business with massive companies that can steamroll their way over the ability of smaller entities to participate. Signing up for a service from Yahoo (free or paid) or the parent companies of any of the other corporations mentioned in this post might be quick and easy (and probably even “free” of monetary cost), but there is always a price to be paid down the road. We and you are paying it today.

The workaround we’re working on may solve this issue, but there is still the risk that Yahoo will notice what we’ve done and block that avenue too. If you’re forwarding email from your domain to a Yahoo account, we strongly suggest that you stop doing that. If you’re doing that or using personal, free accounts for business use on Yahoo or other free email providers, we also strongly suggest you stop doing that. If you need help achieving — with your own domain and the hosting services you’re already paying for — what you’re currently doing with free email accounts with third-party providers, talk to us and we’ll help you do it a better way.

Further updates will continue to be posted here as they become available.

We have become aware of the fact that Yahoo is either delaying or, in come cases, outright refusing email from our primary mail server. This seems very odd, as our mail server’s IP address is not in any of the major anti-spam blacklists, and other major email providers (e.g., AOL, Gmail, Hotmail, Apple, etc.) are not blocking us.

We have been unsuccessful in trying to contact Yahoo about this as, like most massive companies, they put up massive barriers to communication from small companies or individuals.

An obvious exception to this that we have happily dealt with before to solve similar issues is AOL, who provide an excellent website where companies like NinerNet can look up the “reputation” of their mail servers’ IP addresses, and initiate communication with people who are willing and able to help address issues. Interestingly, this is AOL’s current report on the reputation of the mail server that Yahoo is blocking:

212.71.255.195 [nc027.ninernet.net] Reputation is Good

What does a good reputation mean?

The IP address has a good reputation. This means AOL has enough data to determine that the IP address is a known mail sender with a good reputation. You should not be experiencing bounce or reject errors when sending mail from this IP.

Reputation of NinerNet mail server IP address with AOL.

We will monitor this situation and make further attempts to contact Yahoo and have them explain or remove this block. In the meantime, this serves as yet another example of why using “free” email on monolithic systems run by massive companies is a bad idea.