A secondary sending domain is an extra domain you send cold email from, alongside your main company domain. For example, if your main domain is clothing.com, you might send from fitclothing.com.
Sending from secondary domains keeps your main domain's reputation separate from your cold outreach.
How it works
You buy one or more extra domains and create mailboxes on them. You then connect those mailboxes to Smartlead and add them to your campaigns, the same way as any other mailbox.
Your sending volume is spread across these mailboxes and domains. If one domain runs into deliverability problems, your main domain isn't affected.
When to use it
You want to protect your main domain, which you use for everyday business email.
You want to send more cold email than a few mailboxes on one domain can handle.
You want to keep outreach for different products or clients on separate domains.
Good to know
Pick domains close to your brand. For example,
fitclothing.comorclothing.defor a main domain ofclothing.com.Prefer common top-level domains like .com, .de, .in or .be. Avoid extensions like .biz or .online.
Avoid domains with numbers or hyphens.
You can buy domains from any registrar, such as GoDaddy, Bluehost, Hostinger or Domain.com. You can also buy domains and mailboxes inside Smartlead with SmartSenders.
When you compare registrars, check renewal prices, transfer rules and expiry policies, not just the first-year price.
FAQ
Why use a secondary domain instead of my main domain?
It keeps the reputation of your main domain separate from your cold outreach. Problems on a secondary domain don't spill over to the domain you use for everyday email.
Can I use several secondary domains at the same time?
Yes. Each mailbox is connected to Smartlead on its own, so you can add mailboxes from as many domains as you need to a campaign.
Do I need a custom tracking domain for each secondary domain?
A custom tracking domain is set per mailbox. See the related article below for how to set it up.