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posted by martyb on Friday January 21 2022, @03:44PM   Printer-friendly

This actually seem to have started at least early in December. Microsoft (Hotmail) seemed to block all incoming mail from Linode, without alerting the recipient or routing to the spam folder. Looks like the problem is still afflicting Linode customers.

Email Blocklisting: A Christmas Gift From Microsoft That Linode Cant Seem to Return:

"Microsoft appears to have delivered the unwanted Christmas gift of email blocklisting to Linode IP addresses, and two weeks into 2022 the company does not seem ready to relent.

Problems started as large chunks of the world began packing up for the festive period. Complaints cropped up on Linode's support forums when customers began encountering problems sending email to Microsoft 365 accounts from their own email servers.

[...] More recently, the Linode team has offered to swap out affected IPv4 addresses for unaffected ones – or, for a fee, it will add some new ones to users faced with the problem. "While we cannot control how long it takes for Microsoft to address the issues on their end," said Linode, "we do have potential solutions that we can offer in order to help customers avoid the current 'Banned Sender' bounces."

[...] Blocklisting IP addresses to prevent the delivery of unwanted emails is not a particularly complicated concept, although Microsoft has perhaps been a little more enthusiastic about this than is strictly necessary over the years. In 2019, tsoHost's bulk email domain found itself on the naughty step for Outlook and Hotmail addresses and getting itself off again proved a bit of a challenge.

Linode itself is an infrastructure-as-a-service outfit, with data centres spread around the world. One can host one's applications (including email services) and data on its platform as an alternative to the bigger boys. Right up until Microsoft decides to slap the IP addresses one is sending from on to a blocklist.


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  • (Score: 2) by crafoo on Friday January 21 2022, @04:01PM (3 children)

    by crafoo (6639) on Friday January 21 2022, @04:01PM (#1214516)

    They are a private company they can do what they want.

    That's what I hear when companies abuse individuals and groups that the majority doesn't like all that well. Of course it's completely disingenuous thing to say. Private companies are held to thousands of individual laws and employee teams of lawyers to make sure politicians and judges are fat and happy.

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  • (Score: 3, Interesting) by DannyB on Friday January 21 2022, @04:46PM (2 children)

    by DannyB (5839) Subscriber Badge on Friday January 21 2022, @04:46PM (#1214524) Journal

    They are a private company they can do what they want.

    That's what I hear when companies abuse individuals and groups that the majority doesn't like all that well.

    What you are hearing is when companies choose to not do business with certain individuals. Compared with companies not accepting inbound mails from certain addresses. In both cases, the companies choose to do this out of self interest. Because doing business with certain individuals has a a high cost (liability, reputational, security, etc) or accepting certain emails has a high cost.

    Microsoft probably really does not have to accept emails from Linode. But it is probably in their best interest to do so, excluding those Linode customers who are bad actors.

    Walmart does not just ban people for life from all Walmarts everywhere without a good reason. They WANT customers coming in their stores. Something pushed them over the edge. Likewise Microsoft does not block inbound email without good reason -- even if in this case Microsoft's email block is way overly broad.

    I don't see a problem in general with either. (1) companies choosing to not do business with certain people who cost them more to do business with than they are worth, and (2) companies choosing to block inbound email from certain IP addresses or ranges. (although Microsoft's block is overly large)

    It's not so different from social media platforms that see a high cost to allowing certain individuals to use their platform despite repeated warnings not to engage in certain bad behavior.

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    • (Score: 2) by HiThere on Friday January 21 2022, @09:28PM (1 child)

      by HiThere (866) Subscriber Badge on Friday January 21 2022, @09:28PM (#1214628) Journal

      I have a big problem with monopolies, including "monopoly over a line of communication" choosing not to do business with someone. But I have a bigger problem if they accept the messages and just drop them.

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      • (Score: 2) by FatPhil on Sunday January 23 2022, @12:04PM

        by FatPhil (863) <{pc-soylent} {at} {asdf.fi}> on Sunday January 23 2022, @12:04PM (#1214979) Homepage
        I think that's what MS might have been doing. Several subscribers mentioned to the admins that they had problems receiving SN mails, so we did some sniffing around - SN's mail servers, hosted on Linode, didn't know there was any problem, MS's mail servers had accepted the message, and then binned it.
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