Who are email inbox providers?
As a marketer, you’re familiar with email service provider (ESP) softwares like Klaviyo that help bulk senders manage their mass email communications. But have you ever stopped to think about the third-parties who control the inboxes of your recipients? We refer to these service providers as email inbox providers. Some of the most popular providers include:
- Gmail
- Yahoo
- Outlook
- iCloud Mail
Each service provider has their own rules and set of standards that they use to determine which email messages should be directed to the spam folder or blocked entirely. The whole purpose of the spam folder is to quarantine messages that are potentially harmful and prevent recipients from engaging with those messages. For this reason, inbox providers are intentionally vague about the criteria they use for spam filtering so they can avoid providing bad actors with too much information.
Understand bulk sender requirements for Gmail, Yahoo, and Microsoft
Gmail, Yahoo, and Microsoft have aligned on requirements for bulk senders, making the three most widely used inbox providers a unified front on bulk sender standards. Each provider defines a bulk sender slightly differently, as shown in the table below.
Inbox provider | How they define a bulk sender | Daily threshold | Addresses covered |
|---|---|---|---|
Google (Gmail) | Domains that send messages to more than 5,000 Gmail users on any given day. This counts every message sent from your domain across the entire internet, including system notifications from your website, transactional messages, and marketing messages. | 5,000 messages per day | Gmail |
Yahoo | Anyone sending a “significant volume” of mail. Yahoo does not publish a specific number. | Not specified | Yahoo |
Microsoft | Senders reaching Microsoft consumer inboxes at the same volume Google uses. | 5,000 messages per day | Outlook.com, Hotmail.com, Live.com |
Unless you are on a free Klaviyo account, or have a very small customer base, you likely fall into the category of bulk sender. Assume these requirements apply to you.
As a bulk sender, your messages are subject to a higher level of scrutiny because you have the ability to reach so many people. The sender requirements that you must meet in order to reach Gmail, Yahoo, and Microsoft inboxes are:
- Authenticate your domain
- Set up a DMARC policy
- Align your sender address to your domain
- Offer one-click unsubscribe
- Keep spam complaints low
We will cover each of these topics in detail throughout the rest of this certificate. By the end of this certificate, you will know exactly how to ensure you are compliant with bulk sender requirements for both Gmail, Yahoo, and Microsoft.