Cold Email & Outreach Glossary
Everything you need to know about cold email, outbound sales, email deliverability, and AI-powered outreach — explained simply.
Learn the language of cold email
Cold email and outbound sales come with their own vocabulary — open rates, bounce rates, DKIM, DMARC, sender reputation, and dozens more. Understanding these terms is the first step to running campaigns that actually land in the inbox.
This email glossary covers every key concept from deliverability fundamentals to AI-powered personalization. Whether you're new to outbound or fine-tuning an existing workflow, you'll find clear, jargon-free definitions below.
From basics to advanced strategy
Start with foundational terms like SPF and warm-up, then explore advanced concepts like voice matching, research-driven personalization, and strategy agents. Each definition links to deeper resources when available.
Use the letter navigation below to jump straight to the term you need, or browse the full list to build your outreach knowledge from the ground up.
B
Bounce Rate
The percentage of sent emails that are returned (bounced) because they couldn't be delivered to the recipient's inbox, either temporarily (soft bounce) or permanently (hard bounce).
Buying Signal
An action, event, or behavior that indicates a prospect may be ready or open to purchasing, used to time outreach for maximum relevance and impact.
C
CAN-SPAM Act
A US federal law that establishes requirements for commercial email, including rules around subject lines, opt-out mechanisms, and sender identification.
CASL (Canadian Anti-Spam Legislation)
Canada's anti-spam law requiring explicit or implied consent before sending commercial electronic messages, with some of the strictest rules among major economies.
Cold Email
An unsolicited email sent to a recipient with no prior relationship, typically used in B2B sales and business development to initiate conversations with potential customers.
Custom Tracking Domain
A custom subdomain used to track email opens and clicks instead of using shared tracking domains, improving deliverability and brand consistency.
D
DKIM (DomainKeys Identified Mail)
An email authentication method that uses cryptographic signatures to verify that an email was sent by the domain it claims to be from and hasn't been altered in transit.
DMARC (Domain-based Message Authentication)
An email authentication protocol that builds on SPF and DKIM to give domain owners control over how unauthenticated emails from their domain are handled.
Domain Reputation
A score assigned by email providers that reflects how trustworthy your email domain is, based on sending history, engagement rates, spam complaints, and authentication.
Drip Campaign
An automated series of pre-written emails sent on a predetermined schedule, designed to nurture leads or guide prospects through a sales funnel over time.
E
Email Deliverability
The ability of an email to successfully reach the recipient's inbox rather than being filtered into spam, bounced, or blocked by email providers.
Email Personalization
The practice of customizing email content for individual recipients based on their data, behavior, and preferences to increase relevance and engagement.
Email Sequence
A series of automated emails sent in a specific order based on time delays or recipient actions, commonly used in sales outreach to follow up with prospects.
Email Sequencing Software
Tools that automate the sending of multi-step email campaigns, managing timing, follow-ups, and recipient engagement tracking across outreach sequences.
Email Throttling
The practice of limiting the rate at which emails are sent to avoid triggering spam filters and to stay within email provider sending limits.
Email Warm-Up
The process of gradually increasing email sending volume from a new or inactive email account to build sender reputation and improve inbox placement rates.
M
Multi-Channel Outreach
A sales strategy that combines multiple communication channels — email, LinkedIn, phone, and social media — in coordinated sequences to maximize prospect engagement.
MX Record
A DNS record that specifies the mail server responsible for receiving email for a domain, essential for email routing and deliverability verification.
O
Open Rate
The percentage of delivered emails that recipients open, tracked via a small invisible pixel embedded in the email.
Outbound Sales
A sales strategy where representatives proactively reach out to potential customers through cold email, cold calling, LinkedIn, and other channels, rather than waiting for inbound leads.
S
Sales Engagement
The practice and technology of systematically interacting with prospects across multiple channels to move them through the sales pipeline, typically involving sequences of emails, calls, and social touches.
SDR (Sales Development Representative)
A sales team member focused on outbound prospecting and lead qualification, responsible for generating meetings and pipeline for account executives.
Sending Limit
The maximum number of emails an email provider allows you to send per day from a single account, set to prevent spam and protect their infrastructure.
SPF (Sender Policy Framework)
An email authentication protocol that allows domain owners to specify which mail servers are authorized to send emails on behalf of their domain.
Suppression List
A list of email addresses or domains that should be excluded from outreach campaigns, typically including unsubscribes, bounces, competitors, and existing customers.
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