What is Graymail and how do you prevent it?

Graymail is a type of email that you technically agreed to receive, but that may serve little to no real purpose for you. Think of commercial newsletters, product announcements, or marketing emails that you opted into when buying something or downloading a resource. There’s a strong chance your inbox already contains plenty of graymail. Our research shows that the average employee receives about 23 graymail messages per week.

Graymail is different from spam, which is unsolicited and often malicious. Because you subscribed to graymail at some point, it is generally harmless, but not necessarily useful. Over time, these emails can become irrelevant and are often mistaken for spam. That’s where the term comes from. Graymail sits in the space between spam and genuinely valuable email.

How Does Graymail Work?

Graymail emails are commercial messages sent in bulk to large distribution lists. While recipients have technically opted in, that consent may have been given unintentionally or with different expectations around the type of communication.

A common example is when you purchase a product or service and share your contact details, including your email address. As part of the transaction, you agree to receive additional communication. Months later, you may still be getting newsletters and marketing emails that no longer interest you.

In a workplace setting, graymail can also include department or company wide emails that may be relevant to some colleagues, but not to you.

How To Get Rid of Graymail

Graymail is usually not harmful, but it can be annoying and time consuming. For people who want to maintain a clean inbox, dealing with graymail often takes more effort than expected. There are several ways to reduce the impact of graymail.

Use built in email filtering:
The default spam filters in Gmail and Outlook can help separate unwanted emails. Gmail automatically places most commercial emails into the Promotions folder, where graymail typically ends up. Outlook allows users to set up mail flow rules to identify bulk email and mark it as spam, which can remove a large portion of graymail from the inbox.

Block or unsubscribe:
Since graymail is sent with prior consent, unsubscribing from a mailing list or blocking a sender will stop future messages. This approach works well for reducing emails from a small number of senders, but it is not very scalable.

Use an enterprise solution:
Advanced email security platforms can detect and block graymail that standard Gmail or Outlook filters fail to catch. These solutions analyze sender authentication as well as message content and intent to identify unwanted commercial email.

Abnormal vs. Graymail

Abnormal Security’s email productivity feature detects and removes graymail from employee inboxes automatically. Instead of relying on static filter rules or requiring users to manually report unwanted messages, Abnormal automates graymail detection.

Abnormal analyzes tens of thousands of signals from Microsoft 365 to understand email behavior across the organization and at the individual user level. This allows the platform to learn which emails users engage with and which ones they consistently ignore.

By doing this, Abnormal removes the need for manual filters and separate quarantine portals. An email that one employee considers unwanted will not automatically be treated the same way for everyone else. With 32 percent of employees spending at least an hour per day managing email, Abnormal’s graymail capability saves time and reduces inbox clutter at scale.

Graymail vs. Spam: What’s the Difference?

The main difference between graymail and spam comes down to consent.

Graymail is sent to recipients who have agreed to receive communication, whether intentionally or accidentally. Spam is sent without permission. Graymail is generally harmless but distracting, while spam often includes scams or malware. The distinction is not always clear, and together they account for a large share of all email traffic.

Why Beating Graymail Starts With a Strong Security Foundation

To truly stay in control of inbox noise and potential threats, organizations should look beyond quick fixes and focus on foundational security measures. At Cegeka, we believe effective email security starts with a strong baseline: clear governance, intelligent filtering, user awareness, and continuous monitoring through a modern SOC. By combining these elements, businesses can not only reduce graymail, but also strengthen their overall resilience against more advanced email based threats.

Source: Insights on graymail detection and email productivity are supported by Abnormal AI, a trusted partner of Cegeka.