Sending 100,000 emails a month costs between about $10 and $115, depending on the provider. As of October 2026, Amazon SES charges about $10 for sending alone, SendGrid Essentials $34.95, Resend Pro $35, Mailgun Scale $90 and Postmark $115. For most senders at this volume, the right answer is one of the cheap shared-IP plans, and this post explains why.

We sell dedicated servers, and we'll say it plainly: at 100,000 emails a month, you probably don't need one yet.

The numbers at 100,000 emails a month

Monthly cost as of October 2026, using the cheapest published option. Confirm on each vendor's pricing page.

Provider Shared IPs With a dedicated IP How we got it
Amazon SES $10 $34.95 $0.10 per 1,000, + $24.95 per IP
SendGrid $34.95 $89.95 Essentials 100k; Pro 100k includes an IP
Resend $35 $120 Pro 100k; Scale 100k ($90) + $30 IP
Mailgun $90 $90 Scale 100k includes one IP
Postmark $115 not available Basic 125k tier; IPs need 300k+ a month

A few notes:

  • Resend and SendGrid tie on price. Both cost about $35 for 100k on shared IPs. Pick on developer experience and features; our Resend vs SendGrid comparison covers the differences.
  • Mailgun's cheapest option at 100k is its Scale plan. Foundation ($35 for 50k) plus overage comes to about $100, so Scale at $90 wins, and it includes a dedicated IP.
  • Postmark prices by volume tier. 100k falls into its 125k tier, $115 on Basic. Its dedicated IPs start at 300,000 emails a month.

Costs beyond the plan price

The table shows sending fees. A few other charges catch people out at this volume:

  • Marketing email is often billed separately. Resend bills marketing email by number of contacts, on top of the transactional plan, and SendGrid's Marketing Campaigns are a separate product with their own pricing. If one tool sends both your receipts and your newsletter, check both price lists.
  • Overage instead of a bigger plan. Most plans let you go over and charge per extra 1,000 emails. That's fine for an occasional spike, but if you're over every month, the next tier up is usually cheaper. On Resend Pro, every extra 1,000 is $0.90; on Postmark Basic, $1.80.
  • Validation and add-ons. Email validation, extra domains, longer log retention and dedicated IPs are priced separately at several providers. Compare the plan you'd actually need, not the headline plan.
  • Engineering time on SES. The $10 SES figure assumes you'll build bounce processing, suppression and logs. If that takes a developer a few days, it costs more than years of the difference.

For a side-by-side at your exact volume, use the email cost calculator. It shows each provider with and without a dedicated IP.

Why a dedicated IP usually isn't worth it yet

100,000 emails a month is about 3,300 a day. Gmail, Outlook and Yahoo judge an IP by its recent sending history, and a few thousand emails a day, often unevenly spread, is a thin history to judge. On a dedicated IP you also lose the cushion of a shared pool: every bounce and complaint lands on your IP alone.

A new IP also needs IP warm-up: weeks of gradually increasing volume before it carries your full traffic. At this volume, that effort rarely pays off.

A reputable provider's shared pool already has a long history with every mailbox provider. For most senders at 100k a month, it delivers as well as a dedicated IP, often better. Our post on shared vs dedicated IPs goes into the trade-off.

When a dedicated IP makes sense anyway: your volume is about to grow past 200,000 a month, or you send steady, highly engaged mail and a shared pool has hurt you before. In that case, start the warm-up early.

What actually decides your inbox placement at this volume

If your mail is landing in spam at 100,000 a month, the IP is rarely the reason. Check these first:

  1. Authentication. SPF and DKIM must pass, and DMARC must be published with your From domain aligned. Our email health checker tests your DNS in seconds.
  2. One-click unsubscribe on marketing mail. Gmail and Yahoo require it from bulk senders. Paste a sent email into our bulk sender checker to see whether yours has it.
  3. List quality. Old, unconfirmed or inactive addresses cause bounces and spam complaints. Gmail wants complaints under 0.3%.
  4. Reverse DNS and TLS. Hosted providers handle these for you; on your own server, you set them up.

Want someone to do it for you? Our deliverability fix audits and fixes SPF, DKIM, DMARC and reverse DNS for one domain for $199, on whatever provider you use.

When to revisit

Look again when you're heading past 200,000–250,000 emails a month. That's where per-email pricing starts adding up, a dedicated IP gets enough traffic to hold a reputation, and the options change. Our 250k cost breakdown picks up from there.

Costs at other volumes