Subdomain or root domain?
Choose a sending domain that fits your existing email setup.
Use mail.example.com for app email, especially if example.com already handles business email through another provider.
Compare your options
| Option | Example From address | When to use it |
|---|---|---|
Root domain · example.com | hello@example.com | You want your main domain in the sender address and can coordinate its existing email policies. |
Subdomain · mail.example.com | hello@mail.example.com | You want a distinct sending identity for your app, separate from business email. |
A subdomain is part of a domain you already own; you don't need to buy another domain. You do need access to its DNS settings.
Keep different email types separate
Use distinct subdomains when you send both transactional and marketing email:
| Email type | Example domain | Example message |
|---|---|---|
| Transactional | mail.example.com | Password resets, receipts and app notifications. |
| Marketing | news.example.com | Newsletters and promotions. |
This makes the sending streams easier to identify and monitor. It can help manage reputation separately, but doesn't guarantee that issues with one stream won't affect the wider domain.
Learn more about separating sending streams →
Match your sender address
For a domain configured as mail.example.com, use an address such as hello@mail.example.com in From. If you want to send as hello@example.com, configure the root domain for that sending identity.
To receive replies at your existing inbox, use Reply-To, such as support@example.com. Adding a sending domain in SendMero doesn't create a mailbox for it.
Learn more about From and Reply-To →
Add the domain you chose
- Open Sending Domains → Add domain.
- Enter the root domain or subdomain you want to send from.
- Choose its traffic type, then add and verify its DNS records.
Follow the domain setup steps →
Keep records used by your existing email provider. If you choose the root domain, update its existing SPF policy as instructed rather than publishing a second one. For a subdomain, review inherited DMARC protection before adding a new policy.
Learn more about DNS records →
- Choose a clear name such as
mailornewsand use it consistently. - Coordinate DNS changes with whoever manages your business email.
- Monitor delivery results for each sending domain in Activity and Overview.