> That ("Anthropic's" deliverability issue) is a Microsoft issue. Emphasizing this. Validation emails sent to Microsoft hosted email are at high risk of never

> That ("Anthropic's" deliverability issue) is a Microsoft issue. Emphasizing this. Validation emails sent to Microsoft hosted email are at high risk of never arriving. For at least 2 years I've seen this on MS's free, paid and enterprise/hosted services. The issue is per validator; mails all arrive or none ever will. Generally I'll try again months later and find that service is still blocked.