There's always something interesting to talk about in this industry. Here are a selection of stories that caught our eye over the last month or so.
Microsoft throttle outbound emails from tenants using 'onmicrosoft' domains
Starting Oct 15, Microsoft will throttle outbound emails from tenants using default "onmicrosoft" domains, capping them at 100 external recipients per day.
To prevent misuse and help improve deliverability of customer email by encouraging best practices, we are changing our policy. In the future, MOERA domains should only be used for testing purposes, not regular email sending. We will be introducing throttling to limit messages sent from onmicrosoft.com domains to 100 external recipients per organization per 24 hour rolling window. Inbound messages won't be affected. External recipients are counted after the expansion of any of the original recipients. When a sender hits the throttling limit, they will receive NDRs with the code 550 5.7.236 for any attempts to send to external recipients while the tenant is throttled.
Source: Microsoft Exchange Team Blog
AT&T consumer email domains migrated to Yahoo
Yahoo has completed the migration of all AT&T consumer email domains to Yahoo Mail. MX records for these domains now point directly to Yahoo's servers - no more AT&T specific gateways or filtering.
To recap, affected domains are: ameritech.net, att.net, bellsouth.net, currently.com, flash.net, nvbell.net, pacbell.net, prodigy.net, sbcglobal.net, snet.net, swbell.net, wans.net, and worldnet.att.net. These are all now fully Yahoo Mail domains, from a sender's perspective. In the past, they were a bit of a hybrid configuration; with AT&T specific inbound mail gateways, and AT&T specific filtering, even though the mail eventually landed in mailboxes hosted on Yahoo Mail's servers.
Source: Spam Resource
Google update their DMARC reports
Google has enhanced its DMARC reports to include detailed reasons for email authentication failures, such as SPF, DKIM, and alignment issues.
Google has rolled out a helpful update to its DMARC aggregate reports: new diagnostic details about why an email fails sender authentication requirements. This approach helps senders of all sizes understand how they’re doing with respect to Google’s sender requirements in one place (their DMARC report) instead of needing to evaluate compliance from service to service and SMTP log to SMTP log.
Source: Valimail Blog
Exclaimer release their "The State of Business Email 2025" report.
Exclaimer have released their "The State of Business Email 2025" report. Despite new collaboration tools and AI assistants, email is still central to business operations - especially when security, compliance, and auditability matter.
This year’s State of Email report, based on insights from 4,009 IT leaders across the UK, US, Germany, and Australia —reveals a paradox: email is relied on more than ever, yet often managed with outdated processes and insufficient investment. IT leaders are expected to secure the most targeted part of the stack, modernize legacy workflows, maintain compliance, and support brand consistency—often without the tools, automation, or authority to do it effectively.
Source: Exclaimer
ZeroBounce publish their 2025 "Gen Z at Work" report.
42% of Gen Zers say email is their favourite way to talk at work, more than double the number who chose apps like Slack or WhatsApp (20%). Texting came in third with 15%, while social media messaging wasn’t far behind at 14%.
We surveyed nearly 1,400 Gen Zers across the US, Canada, the UK, and other European countries to find out. We wanted to understand how this generation uses email and what truly makes them tick – like whether email hinders their productivity or if salary matters more than purpose. The insights? They just might change how you communicate with this generation – and help you build stronger connections to the Gen Zers around you.
Source: Zero Bounce