It’s Time to Bounce Back: ESP-Specific Strategies That Actually Work
Whether you are running cold outreach, nurturing leads, or sending out transactional updates, bounced emails are an annoyance—and more than that, they signal that something is wrong. At Warmy.io, we’ve been running controlled deliverability experiments across major email service providers (ESPs)—Gmail, Outlook/MS365, Yahoo, AOL, and Zoho—to understand exactly why emails bounce, what those bounce codes […]
Don’t Let Your Pixels Hide: The Impact of Tracking Links and Images on Gmail and Google Workspace Deliverability
In cold email outreach campaigns, deliverability is a legit concern. And even after you draft the perfect email, the success of your campaign hinges on the email getting into the recipient’s inbox. But even if an email does make it to the inbox, there’s another challenge: tracking accuracy. For Gmail and Google Workspace (GW) users, […]
Inbox vs. Spam: How DNS Configuration & Email Templates Affect Your Email Success
One of the essential factors for any successful email outreach strategy is email deliverability. It doesn’t matter if you are sending cold emails, marketing campaigns, or transactional messages—they all rely on a few elements to ensure that they actually land in the inbox and not the spam folder. This is where DNS email authentication protocols come […]
Are Blacklists Killing Your Emails? A Deep Dive into How They Influence Email Providers
In 2025, email remains one of the best ways to reach prospects and customers. But deliverability isn’t guaranteed—especially if your domain or IP lands on a third-party spam blacklist. These DNS-based blocklists (DNSBLs) are maintained by anti-spam organizations and used by email providers to filter out unwanted messages. For senders, being listed in even one […]
Mastering Global Email Deliverability in 2024–2025
In today’s interconnected world, email as a communication channel is a double-edged sword. It’s easy, quick and allows businesses to connect with multiple clients at the same time. But some specific sending behavior combined with other technical factors can lead businesses to be labeled as questionable–not a great result for a worldwide business. Thus, worldwide email […]
Thread or Dread: GSuite vs. MS365 in Follow-Up Deliverability
In the world of email deliverability, most senders obsess over one moment: the first send. Will it land in the inbox or spiral into spam? But what if that moment matters far more than we ever realized? At Warmy.io, we set out to explore a critical but overlooked question: Does the inbox placement of your […]
Cracking the Inbox Code: What Speeds Up Outlook Delivery from Different SMTP Providers?
If you’ve ever wondered why some domains warm up faster than others, you’re not alone. For marketers and businesses, speed to inbox can make or break a campaign’s success—especially when sending to major providers like Outlook. With more than 400 million active email users worldwide and an 8.10% market share, getting your emails to land […]
How to Avoid Email Blocks: Lessons from MS365’s Deliverability Research
Email deliverability—crucial yet often elusive goal for businesses aiming to connect with their audience. But there’s a harsh reality: As good as your content is and as personalized as your outreach is, if your emails don’t reach that inbox, they just don’t work. In a time when inboxes are bombarded with spam and unwanted emails, […]
