Mailbox providers & blocklists
An important part of email marketing is understanding how different mailbox providers work, what blocklists are important and how to get delisted. Use this section to learn more about specific mailbox providers, blocklists, and spam filters so you can ensure that your email gets delivered to your subscribers' inboxes.
Gmail, Microsoft, and Yahoo
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How do my IP and domain reputations as shown in Gmail's Postmaster Tools impact deliverability?
Gmail published the guidelines below in their Help Center to help you understand how your IP or d...
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What is Microsoft's anti-spoofing protection change and how does it impact me?
What is Microsoft's anti-spoofing protection change? Microsoft frequently enhances their spam fil...
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How to use Microsoft's Preemptive Accommodation process for IP Warm Ups
Improve the IP warm up process with Microsoft by asking for Preemptive Accommodation. Following t...
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How to use Everest to identify a message classifed as spoofed at Microsoft
An important part of Microsoft's anti-spoofing protection technology is the introduction of Compo...
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How to use email annotations to add your brand's logo for Gmail subscribers
When email annotations are implemented correctly, your logo appears with the email preview, along...
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What are the Gmail, Yahoo! and Microsoft unsubscribe features and how do they affect my email program?
One of the challenges mailbox providers face when filtering incoming email is identifying unwante...
Mailbox providers
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What is the difference between a B2B hosted mailbox and a B2B filtering company?
Sending email campaigns to business addresses can be a very difference experience from sending to...
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Apple deliverability best practices
Service integration largely affects Apple Mail deliverability. For example, campaigns sent to a r...
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Apple overview
Apple, a U.S.-based mailbox provider (MBP), offers a free email service called iCloud Mail. iClou...
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Country Overview: Russia
Overview There are approximately 146 million people in Russia and, as of 2022, there are approxim...
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Yandex troubleshooting support information
Yandex troubleshooting support Make sure you follow sending best practices when sending to Yande...
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Yandex deliverability best practices
Yandex has fairly strict sending requirements in order for your email to reach the inbox. Followi...
Blocklists
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Why is my IP address listed on the Return Path Blocklist and what can I do about it?
The Return Path Blocklist uses data sources from our partners and state of the art technology to ...
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Return Path Blocklist (RPBL) FAQ
What is the Return Path Blocklist? The Return Path Blocklist (RPBL) is a list of IP addresses th...
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URIBL blocklist
Overview The URIBL blocklist lists domains appearing in spam and is used with anti-spam software ...
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Truncate blocklist
Overview The Truncate blocklist identifies potential sources of spam, scams, viruses, and malware...
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SPFBL blocklist
Overview The SPFBL blocklist identifies potential sources of spam using reputation data collected...
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SpamRATS! blocklist
Overview SpamRATS! is a real-time blocklist used to identify spam originating from botnets and co...
Spam filters
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How do spam filters work?
The purpose of a spam filter is to prevent unsolicited or spam email from reaching the inbox. Spa...
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What is the SpamAssassin score?
SpamAssassin is a widely-used mail filter designed to identify spam by testing a number of email ...
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Why does my Everest inbox test show missing mail at a B2B filtering company?
Troubleshooting B2B deliverability can be a challenge. Many companies deploy third-party spam fil...
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Which mailbox providers (MBPs) use Cloudmark for spam filtering?
The mailbox providers that use Cloudmark for spam filtering are listed in the table below. This l...
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Barracuda Email Security Gateway overview and troubleshooting tips
Barracuda is a leading email and web security vendor with products spanning email, network and ap...
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Mimecast overview and troubleshooting tips
Mimecast is a leading email security vendor with products spanning email and data security. Their...