Compare business software

Documented scope and limits; unverified dimensions remain unknown.
Requirement	SendGrid	Postmark
Pricing	From $19.95/mo Compare all 4 plans	From $15/mo Compare all 5 plans
Who it is for	Email API for application email, priced by monthly send volume and feature tier. Verified Oct 11, 2026 · SendGrid: official product and plan documentation	Sends transactional email and keeps bulk or broadcast email on separate Message Streams. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Coverage limits	The only free option is a 60-day trial at 100 emails a day, not a permanent free plan. Verified Oct 11, 2026 · SendGrid: official product and plan documentation	There is no tier between the free 100 emails a month and the 10,000-email paid tier. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Sending volume	Free Trial 100 emails per day Essentials 50,000 to 100,000 emails a month Pro 100,000 to 2,500,000 emails a month	Unused emails do not roll over to the next billing period. Verified Oct 11, 2026 · Postmark: official product and plan documentation Free 100 emails per month Basic 10,000 emails per month Pro 10,000 emails per month Platform 10,000 emails per month
Sender domains	Not verified	Free 10 custom sending domains Basic 5 custom sending domains Pro 10 custom sending domains Platform Unlimited custom sending domains
Log retention	Free Trial 3 days of searchable email activity Essentials 3 days of searchable email activity Pro 7 days of searchable email activity Premier 7 days of searchable email activity	Custom activity retention starts at USD 5 a month and is only available on Pro plans or higher; statistics are kept indefinitely. Verified Oct 11, 2026 · Postmark: official product and plan documentation Basic 45 days Pro Customizable up to 365 days; 45 days by default Platform Customizable up to 365 days; 45 days by default
Webhooks and events	Free Trial 1 event webhook Essentials 2 event webhooks Pro 5 event webhooks Premier 5 event webhooks	Inbound email is converted to JSON and posted to your webhook URL. Verified Oct 11, 2026 · Postmark: official product and plan documentation Pro Inbound email processing included Platform Inbound email processing included
Dedicated IP	Pro and Premier include dedicated IPs; more can be purchased. Verified Oct 11, 2026 · SendGrid: official product and plan documentation Pro 1 dedicated IP included Premier 1 dedicated IP included	From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher. Fully managed by Postmark. Verified Oct 11, 2026 · Postmark: official product and plan documentation
Support	Access to expert services and personalized support is listed as available for purchase. No price is shown. Verified Oct 11, 2026 · SendGrid: official product and plan documentation	Support requests are handled by the customer success team through support tickets. The pricing page lists no support level per plan. Verified Oct 11, 2026 · Postmark support centre
Overage charges	Sending past the plan's allowance may add overage charges on top of the monthly rate; the rate is not published on the pricing page. SendGrid suggests upgrading if you regularly hit the limit. Verified Oct 11, 2026 · SendGrid: official product and plan documentation	Extra emails on paid plans are calculated at the end of the billing cycle and added to the next month's charge. Verified Oct 11, 2026 · Postmark: official product and plan documentation Free No overages are allowed on Free.
Coverage note	Additional IPs can be bought as an add-on. More history is available for purchase. Volume is selected at purchase.	Starting tier; unlimited emails per day. Not listed on the Basic card.