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Hyo Mail, Gmail and Outlook: which one should send your campaigns?
Gmail and Outlook are excellent mailboxes for conversations. Campaigns to a whole customer list are a different job, with different limits and rules. Here are the facts, taken from each provider's documentation.
| Hyo Mail | Gmail | Outlook | |
|---|---|---|---|
| Built for | Marketing campaigns, automations and transactional email to your customers. | Personal and team conversations from a mailbox. | Personal and team conversations from a mailbox. |
| Daily sending | Your credit balance is your capacity. No plan-based daily cap; very large sends are paced by the sending provider. | Google Workspace: 2,000 messages per user per day, or 500 during the Workspace trial. Personal Gmail: 500 per day. | Exchange Online (Microsoft 365 business): 10,000 recipients per day. Outlook.com with a Microsoft 365 subscription: 5,000 recipients per day, including up to 1,000 people you have not emailed before. |
| Recipients per message | Every subscriber receives their own message, so a list is never pasted into To, Cc or Bcc. | Google Workspace: up to 2,000, of which 500 can be external. Personal Gmail: up to 500. | Exchange Online: set by the administrator, up to 1,000. Outlook.com: up to 500. |
| Rules for bulk email | Built for bulk sending: a verified domain with DKIM, SPF and DMARC, one-click unsubscribe, and automatic suppression of unsubscribes, bounces and complaints. | Senders of more than 5,000 messages a day to Gmail addresses must use SPF, DKIM and DMARC, offer one-click unsubscribe and keep the spam rate below 0.3%. | Microsoft advises Exchange Online customers who send bulk commercial email, such as newsletters, to use a specialised provider. Since May 2025, domains sending more than 5,000 messages a day to Outlook.com addresses must pass SPF, DKIM and DMARC. |
| Audience management | Lists, segments, tags, consent status and suppression in one place, with no contact cap. | Contacts and labels for addressing messages. | Contacts and contact groups for addressing messages. |
Gmail and Outlook figures were checked against the providers' documentation on 18 October 2026. Providers can change their limits at any time.
Use them together
Keep your mailbox. Send campaigns from Hyo Mail.
Most teams keep Gmail or Outlook for everyday email and move campaigns to a platform built for them. Hyo Mail sends from your own verified domain, so your brand stays the same in your customers' inbox.
- Conversations stay in the mailbox your team already uses
- Campaigns, automations and order emails go out through Hyo Mail
- Your subscribers' consent and unsubscribes are respected automatically
Sources
- Google Workspace Admin Help: Gmail sending limits in Google Workspace
- Gmail Help: You have reached a limit for sending mail
- Google Workspace Admin Help: Email sender guidelines
- Microsoft Learn: Exchange Online limits
- Microsoft Support: Sending limits in Outlook.com
- Microsoft Tech Community: Outlook's requirements for high-volume senders
Gmail and Google Workspace are trademarks of Google LLC. Outlook, Microsoft 365 and Exchange Online are trademarks of the Microsoft group of companies. Hyo Mail is not affiliated with or endorsed by either company.
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