Clear blog! But I had all that. SPF, DMARC etc. I had perfect scores on all the online checkers and I was not on blocklists.
The problem is MS just ignores all that and built their own system, one that works on reputation. If you don't send a lot of mail you don't build up reputation and they block you. Over and over. Even if you never send any spam.
The big names just don't care about standards and they have the market share to simply ignore them.
I remember I need to file a complaint with Microsoft. You can also register a few outlook.com accounts and manually train the system :)
Seriously, the whole SPAM situation is way overrated. In the name of fighting SPAM, they (the big email providers) blocks us, but they let all the ads in? To add injury on top of insult, they are lenient for paying corp accounts but very strict for "free" personal accounts?
If this does not tell you what "free" big email providers are, nothing will.
The problem is MS just ignores all that and built their own system, one that works on reputation. If you don't send a lot of mail you don't build up reputation and they block you. Over and over. Even if you never send any spam.
The big names just don't care about standards and they have the market share to simply ignore them.