Blasting Schools Cold in September Is Why You Land in Spam. Warm Your Domain Now.
Since late 2025, Gmail rejects non-compliant bulk email outright instead of quietly filing it under spam, and Microsoft has been bouncing unauthenticated volume senders with a hard 550 error since May 2025. If your school list sat untouched since the last bell rang in June, email deliverability to schools this September depends almost entirely on what you do in the…
