Cooper Email vs Mailgun

Mailgun is an email delivery API with inbound routes. Cooper is an agent inbox that stores and searches mail.

Mailgun’s free plan is a daily send cap with short log retention. Cooper Free is a monthly inbox allowance.

	Mailgun	Cooper Email
Free	$0 · 100 emails/day · 1 custom sending domain · 1 inbound route · 1 day log retention	$0 · 5 inboxes · 5,000 emails/month · 1 custom domain · mail kept until the account holder asks for deletion
Basic	Starting at $15/month · 10,000 emails/month · 1 custom domain · 5 inbound routes · overage from $1.80 / 1,000	Starter $12/month · 25 inboxes · 25,000 emails/month · 15 custom domains
Foundation	Free for 1 month, then $35/month · 50,000 emails/month · 1,000 custom sending domains · overage from $1.30 / 1,000	Pro $99/month · 300 inboxes · 250,000 emails/month · 200 custom domains
Scale	Free for 1 month, then $90/month · 100,000 emails/month · overage from $1.10 / 1,000	Pro stays $99/month through 250,000 emails. Extra email is $1 per 1,000 with POST /api/v1/billing/addons {"email_packs":N}
Stored inbox	Log retention from 1 to 30 days depending on plan. Inbound routes forward mail.	Messages stored for the account, searchable, with message.received webhooks

Mailgun Enterprise is custom. Dedicated IP prices are on Mailgun’s page and are not a Cooper feature.
Cooper does not offer Mailgun’s validation product or send-time optimization.