Sending servers

EmailFlow AI is a bring-your-own-server platform. You connect your own sending provider — Amazon SES, SendGrid, Mailgun, Elastic Email, SparkPost, Blastengine, or any standard SMTP relay — and we use it to deliver your campaigns and automations. Because you own the pipe, email volume is unlimited on every plan, including Free.

Why bring your own server?

Connecting your own provider has two big advantages. First, cost: you pay your provider's wholesale sending rate instead of a marked-up per-email price. Amazon SES, for example, is about $1 per 10,000 emails — a fraction of what bundled-sending platforms charge. Second, control: your sending reputation, your IP, your relationship with the provider. If you already send through a vendor your DNS trusts, you keep using it.

EmailFlow AI provides everything around the send — the AI email builder, automations, lists, segments, contact verification, and analytics — while your provider does the actual delivery. Plans are sized by contacts and AI tokens, never by how many emails you send.

Supported providers

Amazon SES — recommended. Cheapest, highest deliverability, and the fastest to set up. See the Amazon SES setup guide.
SendGrid — Web API or SMTP, with an API key.
Mailgun — HTTP API or SMTP, popular with developers.
Elastic Email — cost-effective bulk sending.
SparkPost — analytics-rich transactional API.
Blastengine — Japanese transactional email service.
Generic SMTP — any host, port, and credentials. See Other providers & SMTP.

Why we recommend Amazon SES

For most senders, Amazon SES is the best starting point. It is the least expensive option at roughly $1 per 10,000 emails, it has excellent deliverability backed by AWS infrastructure, and it supports both an API and an SMTP interface. In the sending-server picker, Amazon SES appears first with a Recommended badge. Our step-by-step SES guide walks you through creating an IAM user, getting your keys, choosing a region, and leaving the SES sandbox.

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You can connect more than one provider. EmailFlow AI will route across the servers you add, so you can mix vendors or keep a backup.

Connecting a server

Open Sending › Servers, choose Add server, and pick your provider. Paste your API key or SMTP credentials, send a one-shot test to confirm the connection, and you are live. Pair your server with an authenticated sending domain (DKIM) and a custom tracking domain so your links and signatures are fully branded.

Fair-use rate guard

Sending volume is unlimited, but each plan has a light per-hour send-rate guard. This is not a monthly cap — it simply paces bursts to protect shared infrastructure and your own provider's reputation. The vast majority of senders never touch it, and if you run time-sensitive high-volume sends, higher rates are available on request.

Frequently asked questions

Do I have to run my own mail server? No. You connect an account with a hosted provider like Amazon SES — there is no physical server or self-hosted MTA to manage. Setup takes a couple of minutes.

Is sending really unlimited? Yes. Because you send through your own provider, EmailFlow AI does not meter email volume on any plan. You pay your provider directly for what you send.

Which provider should I choose? Amazon SES if you are unsure — it is the cheapest and easiest. If you already use SendGrid, Mailgun, or another vendor, connect that instead.