Category: Blog

The fastest way to send email in Python is with the standard library: smtplib + EmailMessage. Here is a minimal working example that connects to an SMTP server and sends a plain-text message: That covers the hello-world case. For production use, most teams send through a transactional email service rather than raw SMTP. The sections…

DMARC (Domain-based Message Authentication, Reporting & Conformance) tells receiving mail servers what to do when a message claims to be from your domain but fails SPF or DKIM checks. Setting it up takes about 15 minutes: you publish one DNS TXT record, collect reports for a few weeks, and then tighten the policy. Start here:…

A transactional email is an automated, one-to-one message sent to a specific user in direct response to an action they took or a system event that concerns them: a password reset, an order receipt, an account verification code, a shipping update. Unlike a marketing campaign that goes to a list, a transactional email is triggered…

Cold email and lifecycle email marketing serve different jobs in a SaaS growth strategy — and most teams conflate them. Here is how to run both channels correctly, why deliverability is the deciding factor in cold outreach, and where Cold Letter fits in.

Cold email remains one of the highest-ROI outreach channels for SaaS teams — when built on the right infrastructure. Learn how to structure campaigns, authenticate your domain, and use Cold Letter to book meetings at scale.

Most SaaS teams use the wrong tools for at least one email channel. This guide covers how to pick transactional APIs, lifecycle ESPs, and cold outreach tools at seed, growth, and scale — plus integration and stack decisions that matter.

Most SaaS teams build one onboarding email and call it a lifecycle program. Here is how to build the four sequences that actually move users from trial to expansion: onboarding, feature adoption, win-back, and expansion.

Email drives an ROI of $36 for every dollar spent, but only when SaaS teams treat it as three distinct channels, not one. This guide covers the lifecycle sequences, cold outreach tactics, and deliverability fundamentals that separate email programs that grow revenue from those that don’t.