API

Does ColdSend have an API?

Not yet, but it's on our roadmap. Expected release date: Early December 2025. In the meantime, we have ColdInbox API. It doesn't work like ColdSend (i.e., requires warmups) since it is just standard SMTP (Sendgrid wrapper). If you have programmatic email use-cases, feel free to check ColdInbox out. Otherwise, wait till ColdSend API is released. To get started with ColdInbox, email us at hello@coldsend.pro with the subject line, "ColdInbox API" and the email with which you want to register with us. We will send over your API token. Then you can follow this documentation to create inboxes, manage replies, send emails etc.

Can you use ColdSend infrastructure with another cold email tool?

People ask this in three different ways. Below we answer each one, so you know exactly what is (and isn’t) possible today and after our API ships. “Can I point my domain to ColdSend but send the mail from another platform?” No. The moment you delegate your domain to ColdSend we host all authentication records (SPF, DKIM, DMARC) on our name-servers. Because the private DKIM keys never leave our environment, no external sender can sign mail on your behalf without breaking authentication. If you need to split traffic, keep the domain at a neutral DNS host (Cloudflare, Namecheap, etc.) and add the records manually for each platform — exactly what ColdSend is designed to save you from. **“Can I pipe ColdSend mailboxes (SMTP/IMAP) into Instantly, Smartlead, **Reply.io, etc.?” Yes. “Will the upcoming ColdSend API (Dec 2025) let me send through my ColdSend IPs from a different front-end?” Yes, tentatively.