Glossary
Definitions and explanations of key terms in email deliverability, infrastructure, and outbound.
Most Reliable Cold Email Inbox Provider
Learn why Google Workspace and Microsoft 365 are the most reliable inbox providers for cold email at scale and how to configure them for deliverability.
Hmailserver Office 365 Relay
Learn what hmailserver is and why it's used in outbound infrastructure. Understand its role as a self-hosted SMTP relay and its limitations for scaling cold...
PMTA Server
Learn what a PMTA (PowerMTA) server is and why it's critical infrastructure for cold outbound at scale. Understand IP rotation, vMTAs, and configuration.
Email Infrastructure Architecture
Understand why email at scale is an infrastructure problem. Learn how to manage domains, inboxes, and deliverability for sending 100k+ emails per month.
Check Public IP Blacklisted
Learn what a public IP blacklist check is and why it's critical for cold email at scale. Understand how to monitor and protect your sending infrastructure.
Check If IP Is Blacklisted
Learn what an IP blacklist check is and why it's critical for cold outbound at scale. Understand how to monitor IPs to protect deliverability and domain...
PowerMTA™
Learn what PowerMTA is and why this high-volume Message Transfer Agent (MTA) is critical for deliverability and IP reputation at enterprise scale (1M+...
PMTA SMTP
What is PMTA? Learn why PowerMTA is critical for cold outbound at scale, providing control over deliverability, IP reputation, and high-volume sending.
MTA Technology
Learn what an MTA (Mail Transfer Agent) is and why it's a critical piece of infrastructure for cold outbound at scale (100k+ emails/month).
MTA Building
Learn what a Mail Transfer Agent (MTA) is and why it's a critical infrastructure component for high-volume cold email, affecting IP reputation and...
High Volume Email for Microsoft 365
Learn what high-volume email for Microsoft 365 means for teams sending at scale. Understand the infrastructure needed to manage limits, reputation, and...
Private Email Infrastructure
Learn what private email infrastructure is and why it's essential for cold outbound at scale. Understand how to manage domains, IPs, and deliverability.
Email Infrastructure Diagram
Learn what email infrastructure is and why it's critical for cold outbound at scale. See how to manage domains, inboxes, and DNS for deliverability.
Infrastructure Requirements for Email
Learn what cold email infrastructure is and why it's critical for deliverability at scale. For teams sending 100k+ emails, it's more than software.
Check To See If My IP Is Blacklisted
Learn what an IP blacklist check is and why it's a critical part of the infrastructure for teams sending 10k-1M+ cold emails per month to protect...
Cold Email Infra
Learn what cold email infrastructure is and why it's critical for sending 10k-1M+ emails/month. Understand domain reputation, rotation, and deliverability at...
Oracle Cloud Infrastructure Email Delivery Service
Learn what Oracle Cloud Infrastructure (OCI) Email Delivery is and why it matters for cold outbound at scale. Understand its role as an SMTP relay for 1M+...
Cold Email Agency Pricing
Learn how cold email agency pricing impacts infrastructure at scale. Explore models that support deliverability, domain reputation, and high-volume sending.
Outbound Infrastructure
Learn what outbound means at enterprise scale. For teams sending 10k-1M+ emails/month, outbound is an infrastructure problem of domains, inboxes, and...
Cold Email Infrastructure
Learn what cold email infrastructure is, why it's critical for sending 100k+ emails/month, and how to manage domains and inboxes at scale.
Email Infrastructure Provider
Learn what an Email Infrastructure Provider (EIP) is and why it's critical for sending cold email at scale. Understand the difference from a standard ESP.
Domain Blacklist Checker
Learn what a domain blacklist checker is and why it's critical for cold outbound. Understand how to monitor your domain reputation to avoid spam folders.
DKIM Record Generator
Learn what DKIM (DomainKeys Identified Mail) is, why it's critical for cold outbound deliverability, and how to set it up correctly to protect your domain.
Cold Outreach Tracker
Learn what a cold outreach tracker is, why it's crucial for deliverability and campaign performance, and how to use one to keep your domains and reply rates...