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Dartmouth is retiring SMTP Basic Auth in September 2025; this guide shows how to send-only via smtp.office365.com using OAuth2, preferring delegated permissions (SMTP.Send) for security. App-only (SMTP.SendAsApp) is allowed only when scoped to specific mailboxes via an Exchange service principal, and the article outlines roles (App/Dev vs Email Team), key settings, and quick troubleshooting.
- Knowledge Base
- Infrastructure Platforms and Services
- Email Services
Microsoft will retire Basic Authentication for SMTP Auth in Exchange Online, requiring all email-sending applications, devices, and legacy email clients to transition to Modern Authentication (OAuth). This change enhances security, reduces phishing risks, and aligns with Dartmouth’s security strategy. Application administrators and users must take action to update configurations before the deadline.
- Knowledge Base
- Infrastructure Platforms and Services
- Email Services
Learn how to configure applications and devices for email sending at Dartmouth. Basic Authentication for SMTP ends in September 2025—all setups must switch to OAuth. IP relay requests require security approval, and misuse may result in suspension.