Insights on email deliverability, developer tools, and growth strategies.
Gmail and Yahoo have changed the rules. Learn the new email requirements for 2025, why SPF, DKIM, and DMARC are now mandatory, and how to stay compliant without killing deliverability.
MailFlow Engineering
Clicks are declining, inbox algorithms are evolving, and replies are the new signal of trust. Learn how zero-click, reply-driven email marketing is becoming the highest-converting strategy in 2025.
SendMailOS Team
Most marketing emails behave like billboards. This playbook shows how to sell directly by email using conversation-first triggers, reply-driven templates, and deliverability guardrails that keep you in the inbox.
SendMailOS Team
Most email platforms punish you for growing your list. Learn why the old 'pay per contact' model is obsolete and how to switch to a value-based pricing model.
SendMailOS Team
Why split your email stack between Postmark and Mailchimp? Discover the benefits of a unified API for both transactional delivery and marketing broadcasts.
Dev Team
Scaling a newsletter used to mean exponentially higher costs. Here is the playbook for growing a massive audience while keeping your margins healthy.
Growth Lead
SPF, DKIM, DMARC, and BIMI. A technical deep dive into the protocols that ensure your emails actually hit the inbox.
Engineering
SendGrid is the giant of the industry, but they have grown complacent. Here is why modern startups are switching to SendMailOS.
Comparison Team
The holiday season is the busiest time for inboxes. Learn how to cut through the noise, increase open rates, and drive record sales during Black Friday, Cyber Monday, and Christmas.
Marketing Team