Deliverability and infrastructure

Sending domain

Definition

A sending domain is the domain your outbound email is sent from, often a separate lookalike of your main domain to protect its reputation.

Sending domain in practice

Teams running cold email usually buy secondary domains such as getacme.com or tryacme.com instead of sending from acme.com. If a secondary domain's reputation drops, your main domain, the one your invoices and customer email depend on, is not affected. Each secondary domain should redirect to your main site so a curious prospect lands somewhere real.

A sending domain is not ready on the day you buy it. It needs SPF, DKIM, DMARC and MX set up, mailboxes created, and a warmup period before real volume. How many domains you need depends on your daily volume and how much you send per inbox.

Work out how many sending domains you need

Direct connections. Open the full map

Last updated 2026-10-14 by Ishan Vats.

Connected to

Depends on

Feeds into

Cold emailCold email is a one-to-one message to someone you have no prior relationship with, sent because there is a specific reason they might care.

Measured by

Domain reputationDomain reputation is how trustworthy mailbox providers judge your sending domain, built from authentication, complaint rates, bounces and recipient engagement.

Free 30 minute signal audit

See where sending domain fits in a real build.

Book the free 30 minute signal audit. We map the buying signals for your ICP live on the call, and show you where sending domain sits in the system we would build.

Pick a time in the calendar below to schedule a 30 minute call with me.

01You talk. Who you sell to and what you send today.
02We map. The signals that fire for your ICP and the two to start with.
03You keep it. The signal map and a budget range, whether or not you build with us.

Ishan Vats, founder of IV Consulting. We run our own outbound on the same system.

More free GTM tools: Signal library · Email domain checker · Cold email calculator · GTM glossary · GTM and CRM setup

Signal audit · 30 min · free

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