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Transactional email services. Most of them prohibit cold email in their terms; these profiles explain what they are for and what to use instead.
Published prices on the dates shown on each profile. Score is the PureMail rubric score out of 5 (how we score).
| Tool | Price | Mailbox types | Setup | Warmup | Score |
|---|---|---|---|---|---|
| Mailgun | From $15 per month for Basic with 10,000 emails; Foundation $35 for 50,000 or $75 for 100,000; Scale from $90 for 100,000 | Not stated | Minutes for an API key, plus DNS records to verify each sending domain | Automated warmup for dedicated IPs on Scale; there are no mailboxes to warm | 3.2 / 5 |
| Mailtrap | From $15 per month for 10,000 emails on Basic; free plan 4,000 emails a month and 150 a day; the page advertises up to 20% off with annual billing | Not stated | Minutes: add Mailtrap's DNS records to your domain, then send over SMTP or the API with SDKs for Python, PHP, Ruby, Node.js and Java | Automatic IP warm-up with the dedicated IP on Business and Enterprise; not offered on the shared IPs of Free and Basic | 3.4 / 5 |
| Postmark | From $15 per month for Basic at 10,000 emails; Pro $16.50; Platform $18; prices rise with monthly volume | Not stated | Minutes for a server token, plus DKIM and Return-Path DNS records for each sending domain | Dedicated IPs are fully managed; there are no mailboxes to warm | 3.4 / 5 |
| SendGrid | From $19.95 per month for Essentials at 50,000 emails a month; free trial of 100 emails a day for 60 days | Not stated | Minutes for an API key and domain authentication | Automated warmup for dedicated IPs on Pro and Premier; there are no mailboxes to warm | 3.2 / 5 |
Sinch's email API and SMTP relay: free 100 emails a day, Basic $15 a month, Foundation $35 for 50,000, Scale from $90 with a dedicated IP. Not for cold email.
Transactional email API and SMTP service from Railsware: 4,000 emails a month free, then $15 for 10,000 up to $1,250 for 2.5 million; unsolicited email barred.
ActiveCampaign's transactional email service: free 100 emails a month, then $15 to $18 for 10,000 by plan, with separate broadcast streams. Not for cold email.
Twilio's transactional email API and SMTP relay: 60-day free trial, Essentials from $19.95 a month, Pro from $89.95 with dedicated IPs. Not for cold email.