{"id":10324,"date":"2025-12-16T16:16:51","date_gmt":"2025-12-16T15:16:51","guid":{"rendered":"https:\/\/www.retarus.com\/blog\/us\/?p=10324"},"modified":"2025-12-16T16:16:52","modified_gmt":"2025-12-16T15:16:52","slug":"understanding-terrl-how-microsofts-email-sending-limits-could-disrupt-your-business","status":"publish","type":"post","link":"https:\/\/www.retarus.com\/blog\/us\/understanding-terrl-how-microsofts-email-sending-limits-could-disrupt-your-business\/","title":{"rendered":"Understanding TERRL: How Microsoft\u2019s Email Sending Limits Could Disrupt Your Business"},"content":{"rendered":"\n

In Episode 3 of OK. Got it.<\/em>, host Chris Vaccaro sits down with Miriam Carena-Schmitt (Miri), VP of Sales Excellence at Retarus, to break down a fast-growing concern for every organization using Microsoft 365: the new Tenant External Recipient Rate Limit,<\/a> better known as TERRL.<\/p>\n\n\n\n

If your business relies on sending external emails, from invoices to order confirmations to marketing campaigns, these limits may affect your daily operations far more than you realize.<\/p>\n\n\n\n

What is TERRL and why is Microsoft enforcing new outbound sending limits?<\/h2>\n\n\n\n

TERRL stands for Tenant External Recipient Rate Limit, and it\u2019s Microsoft\u2019s way of ensuring that all services inside Microsoft 365 run smoothly. Because email volume affects bandwidth for every application in the M365 suite, Microsoft now restricts how many external emails an organization can send per day.<\/p>\n\n\n\n

These limits apply to every Microsoft 365 customer, regardless of size. According to Miri, TERRL may look harmless, \u201conly five simple letters\u201d, but in practice, it can create major operational risk for companies that depend on high-volume outbound communication.<\/p>\n\n\n\n

How do Microsoft\u2019s new email send limits actually work?<\/h2>\n\n\n\n

Microsoft ties your sending capacity to the number of licensed users in your tenant, not to the number of active mailboxes or applications sending emails.<\/p>\n\n\n\n

For organizations with 100,000 licenses or more, the cap is 1.5 million external emails per day. That may sound like plenty, but as Miri explains, it breaks down to roughly 15 emails per licensed user, and far fewer once you consider:<\/p>\n\n\n\n