Microsoft's new spam filtering is affecting mail deliverability from a number of email service providers. MX Route is recommended here often enough that these issues may crop up for people here
johng•1h ago
I send a lot of email through Sendgrid. It's been blocking them as well.... live.com, outlook.com -- and everything is set up properly but they are still blocking a lot of legitimate email.
Bender•49m ago
A few suggestions [1] as a possible way to drain the queues very slowly, although obviously not a complete solution.
nickweb•1h ago
johng•1h ago