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 Verizon Media (Verizon, AOL, and Yahoo!)
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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 Return Path Platform 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 and Yahoo! smart unsubscribe features and how do they affect my email program?
What is the new smart unsubscribe feature for Gmail? According to AndroidPolice, Google is rollin...
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Microsoft’s Focused Inbox
What is Microsoft’s Focused Inbox? Focused Inbox is a feature included in Microsoft email product...
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How to sign up with Smart Network Data Services (SNDS)
Microsoft offers a service called Smart Network Data Services (SNDS) which helps senders monitor ...
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 143 million people in Russia and, as of 2017, there are approxim...
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Yandex troubleshooting support information
Yandex has a robust postmaster website that gives you statistics about your domain and sending ad...
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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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Spamhaus Domain Block List (DBL)
Overview The Spamhaus Domain Block List (DBL) is a list of domains of spam sources, including kno...
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Return Path Blocklist (RPBL)
Overview The Return Path Blocklist’s (RPBL) algorithm identifies indicators of spam and abusive b...
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What is the difference between a blocklist and a blacklist?
There is no difference between a blocklist and blacklist, and the terms are often used interchang...
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Which blocklists are most important to senders?
There are hundreds of blocklists available, but not all blocklists are created equal. Because any...
Spam filters
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Mimecast overview and troubleshooting tips
Mimecast is a leading email security vendor with products spanning email and data security. Their...
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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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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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Anubis spam filter overview
The Anubis spam filter uses several types of filters in combination: Content-based fingerprintin...