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Documented scope and limits; unverified dimensions remain unknown.
Requirement	SMTP2GO	Mailgun
Pricing	From $15/mo Compare all 4 plans	From $15/mo Compare all 5 plans
Who it is for	Email delivery for transactional email from apps, everyday email from Outlook and marketing email with an unsubscribe link. Verified Oct 11, 2026 · SMTP2GO homepage	Sends application email through an HTTP API or an SMTP endpoint. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
Coverage limits	The free plan is limited to 200 emails a day and does not allow extra emails. Verified Oct 11, 2026 · SMTP2GO pricing, loaded monthly plan cards	Free and Basic allow 1 custom sending domain and 1 day of logs; Foundation raises this to 1,000 domains and 5 days, and Scale keeps 30 days. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
Sending volume	Free 1,000 emails per month Starter 10,000 emails per month Professional 100,000 emails per month Premier More than 3,000,000 emails a month	Free 100 emails per day Basic 10,000 emails per month Foundation 50,000 emails per month Scale 100,000 emails per month
Sender domains	SPF and DKIM are set up automatically for your sending domains. Verified Oct 11, 2026 · SMTP2GO homepage	Free 1 custom sending domain Basic 1 custom sending domain Foundation 1,000 custom sending domains Scale 1,000 custom sending domains
Log retention	Free 5 days of email reporting Starter 30 days of email reporting Professional 30 days of email reporting	Free 1 day of logs Basic 1 day of logs Foundation 5 days of logs Scale 30 days of logs
Webhooks and events	Not verified	Tracking, analytics and webhooks are listed from the Free plan up. Basic, Foundation and Scale cards list them too. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
Dedicated IP	Professional Dedicated IP address included	Extra dedicated IPs cost USD 59 per IP a month. Verified Oct 11, 2026 · Mailgun: official product and plan documentation Foundation Available from the 50,000-email tier; one IP included from 100,000 emails a month Scale One dedicated IP included, plus dedicated IP pools
Support	Starter: ticket, chat and phone support. Verified Oct 11, 2026 · SMTP2GO: official product and plan documentation Free Ticket support; toll-free phone and live chat for the first 14 days only Professional Ticket, chat and phone support	Ticket, chat and phone support depend on the plan. Verified Oct 11, 2026 · Mailgun: official product and plan documentation Free Ticket support Scale Live phone and chat support
Overage charges	Free Extra emails are not permitted on Free.	Extra emails are billed at the start of each month for the previous month, together with the plan fee. The first month is prorated. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
Coverage note	At the default volume shown.	Starting allowance.