The PostShiba blog.
Product updates and email infrastructure notes from the team behind PostShiba.
-
How to structure IP pools for a multi-tenant email platform
Structure IP pools around sender reputation without spreading traffic too thin. A beginner’s guide to isolation, warm-up, and moving customers between pools.
PostShiba Team -
DMARC explained: why SPF and DKIM pass but your email fails
DMARC alignment connects SPF and DKIM to the domain your recipients see. Read example headers, find the mismatch, and plan enforcement without guessing.
PostShiba Team -
Our stance on cold email: don’t send it through PostShiba
Cold email is spam, not a delivery problem to engineer around. Here’s what PostShiba prohibits, why permission matters, and what platforms should send instead.
PostShiba Team -
Magic-link sign-in
You can now sign in to PostShiba with a magic link sent to your email. Open the link to sign in without entering a password.
PostShiba Team -
IP pools
PostShiba now supports IP pools. Group dedicated sending IPs by customer or mail stream, route each message with a header, and control traffic with weights.
PostShiba Team -
PostShiba's public beta is open
PostShiba's public beta is open. Send email from your customers' domains over SMTP or API, test with your team, and request approval for external sending.
PostShiba Team
Email infrastructure for SaaS platforms.
Send from your customers' domains, manage their sending controls, and investigate delivery problems from one place.