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by miohtama
1519 days ago
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Even if one setups everything by the book (SPF, DKIM, DNS.) etc. No one at @outlook.com will receive email, based on my experience. Thus, it does not work well if email is important for business-to-business use. Outlook and Gmail are basically having opaque rules who can receive email and there is no process to get “whitelisted” on these receivers. |
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If you keep an eye on your logs, when your emails are being blackholed (it accepts them but it does not deliver them!) it does provide a link in one of the 550 status messages, where you can get yourself unblocked. I've elaborated here: https://news.ycombinator.com/item?id=31185297
However this only works temporarily, after a month you're back in the doghouse. Only senders which send a large volume of legit traffic are allowed. It's ridiculous but sadly true.
Edit: I found the message in my old emails:
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550 SC-001 (BAY004-MCxxx) Unfortunately, messages from XXX.XXX.XXX.XXX 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.
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In that link the "SC-001" code also refers to that reputation thing. This was the same at outlook.com / hotmail.com and live.com . It did not, however, affect corporate customers using Office 365 / Exchange 365. Only customers of MS' consumer offerings.
My "internet service provider" was a legit colocation service and nothing funny was going on in their network by the way. Microsoft was the only party that had issues with my server. All known blocklists had no issues with it. It was just MS being difficult and making up their own rules.
Anyway going to that link there is a form somewhere to temporarily unblock it. Give it a try.. Perhaps you can create an account at live.com yourself and send a daily test email or something... I thought of doing this but eventually I got so frustrated I gave up on it.