> 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.
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.