Your sending domain is the domain your email is sent from. Authenticating it with DNS records tells mailbox providers your mail is legitimate, which is essential for deliverability. Configure it in Settings → Domain.
Choose a domain
Verify with DNS
Copy the records
Railmail shows the SPF, DKIM and DMARC records to add. For each, note its name, value and TTL.
Add them at your DNS provider
Create the records in your domain’s DNS settings. Changes can take some time to propagate.
Verify
Back in Railmail, click Verify DNS. Once the records are found, the domain becomes verified.
Warming
New domains are warmed: they send under a daily quota that increases over time, moving from an initial phase toward a mature one. This protects your sender reputation. You can monitor the daily limit, bounce rate and complaint rate, and pause or resume warming.
The warming quota can cap how many recipients a campaign reaches per day. If a send is limited, that’s expected during warming.
Domain statuses
Under Settings → Email, configure the compliant footer added to every email: company name and address, and the wording for the unsubscribe and preference-center links (always included). You can add custom footer text, and remove the Powered by Railmail badge on paid plans. 
