Sending Domains
By default, Nitrosend sends your email from a shared sandbox domain — great for trying things out, but capped and not tied to your brand. Add a sending domain you own and your email goes out from your address, on Nitrosend's sending infrastructure, with higher limits and the best inbox placement. There's no separate email provider to wire up.
Add a sending subdomain
- Go to Brand → Domains.
- Under Add a sending domain, enter a subdomain you own — for example
send.yourdomain.com. - Nitrosend generates the DNS records for that subdomain and shows them on screen.
- Add those records at your DNS provider (see below). Nitrosend verifies them automatically — once they resolve, the domain flips to Verified and becomes available as a send-from address.
Use a subdomain, not your primary domain
Always send from a subdomain (send.yourdomain.com), never your bare apex /
primary domain (yourdomain.com).
A subdomain isolates your marketing and product sending — its DNS records and
its sending reputation — from the domain that runs your everyday inbox (for
example Google Workspace or Gmail on yourdomain.com).
That matters for two reasons:
- It keeps your corporate mail untouched. Your primary domain already has mail authentication set up for your team's inboxes. Sending bulk email from it can interfere with that setup — a subdomain leaves it alone.
- It protects your reputation. Sending volume builds a reputation with inbox providers. Keeping it on a dedicated subdomain means a bad send never drags down the domain your team emails from.
This is the setup inbox providers like Gmail expect from senders.
Add the DNS records
The Domains screen lists the exact records for your subdomain — typically a verification record, SPF, DKIM, and a return-path / tracking record. Add each one at your DNS provider (Cloudflare, GoDaddy, Namecheap, Route 53, and so on) exactly as shown.
DNS changes can take anywhere from a few minutes to a couple of days to propagate. Nitrosend re-checks automatically — you don't need to trigger verification manually.
Route different mail through different subdomains
You can verify more than one subdomain and push different email through each by changing the send-from address:
hello@news.yourdomain.com— marketing campaignshello@txn.yourdomain.com— transactional / product email
Splitting sending this way isolates reputation between mail types, so a large promotional send can't drag down your receipts and password resets. This is mostly useful for large-volume senders — most brands are perfectly fine with a single subdomain.
Set a reply-to address
Your send-from address doesn't have to be where replies land. Set a Reply-To under Brand → Sender and replies go to whatever inbox you like — independent of the subdomain you send from.
For example, send from news@send.yourdomain.com but have replies arrive at
hello@yourdomain.com. The Reply-To can be any mailbox you actually monitor, on
any domain.
