Mailbox providers

Service integration largely affects Apple Mail deliverability. For example, campaigns sent to a recipient using Gmail as a backend to Apple Mail will be subject to Gmail’s spam filters. However, there are still a number of best practices you can f...

Amazon Workmail is an email and calendar service offered by Amazon Web Services. It allows businesses to manage email infrastructure using the email client of their choice, including Amazon Simple Email Service (SES), Microsoft Outlook, native iOS...

Sending email campaigns to business addresses can be a very difference experience from sending to consumer addresses. One major reason is that B2B companies often use multiple layers of filtering—first through a filtering company, then through a h...

Apple, a U.S.-based mailbox provider (MBP), offers a free email service called iCloud Mail. iCloud Mail was announced in 2011, and replaced MobileMe accounts through conversion. This article provides an overview of iCloud's infrastructure, filteri...

Overview There are approximately 146 million people in Russia and, as of 2022, there are approximately 112 million internet users. Market landscapeMail.ru is the most widely used mailbox provider in Russia, followed by Yandex, Gmail and Rambler. ...

Yandex is a mailbox and search engine provider based in Russia that has one of the most sophisticated email applications in the world.  In Russia, Yandex has 32.5% of the email market and 56% of the search engine market. It also has been actively ...

Yandex has fairly strict sending requirements in order for your email to reach the inbox. Following all sending requirements at Yandex gives your email the best chance of reaching the inbox. Best practices Use a confirmed opt-in consent method fo...

Yandex troubleshooting support Make sure you follow sending best practices when sending to Yandex. Review your SMTP log files for error codes regarding the delivery issues experienced. Ensure all of your IP addresses are signed up with the Univer...

The Russian webmail service, Mail.ru, was launched in 1998. With more than 100 million active email accounts and 400 million total mailboxes, Mail.ru is the largest webmail provider in Russia and on the European continent, and it is the fifth larg...

Having a good IP address and domain reputation is important to Mail.ru, so be sure to track your reputation using Mail.ru’s sender statistics program.  Mail.ru does not use third-party reputation-based spam filters. It determines an aggregate repu...

Mail.ru built most of its spam filter technology in-house and created its own proprietary bayesian heuristics filters. Mail.ru also has a robust reputation filter that looks at different reputation metrics such as complaints, unknown users, spam t...

Cox Communications is a United States telecommunications provider with over 6 million customers.  According to Cox, as of August 15, 2019, they do not offer the ability for new and existing Cox Internet customers to create new Cox email accounts. ...

EarthLink is an Internet Service Provider (ISP) based in the United States with services including email, web hosting, and data security.  Infrastructure  Region North America: United States Domains Earthlink.net Connection and thr...

Sending successfully to Terra and reaching the inbox is highly dependent on your sending reputation and following sending best practices. While following best practices doesn’t guarantee inbox placement at Terra, it greatly increases your chances ...

Sending successfully to Terra and reaching the inbox is highly dependent on your sending reputation and following sending best practices. While following best practices doesn’t guarantee inbox placement at Terra, it greatly increases your chances ...

Terra Networks, S.A. (Terra) is a Spanish Internet multinational company with headquarters in Spain and offices in Brazil, Chile, Colombia, Mexico, the U.S., and Peru. Part of Telefónica Group (the former Spanish public telephone monopoly), Terra ...

Free provides a postmaster website support page to help senders encountering delivery problems to their customers. Free also provides a blocklist lookup feature, as well as details on common SMTP error codes, and instructions for how to mediate de...

Free cares about your sending reputation as well as respecting their resources when making filtering decisions. It is important to send relevant content to their customers to keep complaints low, engagement high and to stay off of their internal b...

Free is one of the largest telecommunication companies in France and is a subsidiary of Iliad SA. It started business in 1999 during the dot-com boom and quickly gained popularity as an internet provider. Free now offers numerous services to its c...

Rackspace Technology is a cloud services and hosting solutions provider with over 140000 customers worldwide.Infrastructure  Region Primarily in the United States, but Rackspace serves customers worldwide. Domains mailtrust.com; webmai...

Orange’s approach to fighting spam includes filtering on both the reputation of the sender and email content. Using the Vade Filter Engine along with Cloudmark’s Mail Transfer Agent (MTA) and blocklist allows Orange to aggressively protect their c...

Orange has strict consent rules that must be followed in order to send successfully to their customers. It is also important to send relevant content to their customers to keep complaints low, engagement high and to stay off of blocklists. While f...

Orange (formerly France Telecom S.A.) is a global telecommunications company headquartered in Paris, France. With about 43% market share, Orange is the most widely used broadband provider in France. Its reach extends internationally, since close t...

Verizon retired their email service December, 2017. Verizon customers had an option to transfer their Verizon email address to an AOL or Yahoo account. Please visit our Yahoo help articles: Yahoo sending best practices Yahoo troubleshooting suppo...

BT is one of the world's largest providers of telecommunications services and solutions, with operations in more than 170 countries. Infrastructure Region Europe, Middle East and Africa (EMEA): United Kingdom Domains btinternet.com; bt...

TWC uses Cloudmark that factors in customer complaints, IP sending reputation and content in filtering decisions. It scans email for spam-like characteristics and compares your email to your previous emails to help determine filtering decisions. O...

Time Warner Cable’s (TWC) goal for their email service is to ensure their customers receive email they want to receive and keep unwanted email out of their inbox. TWC is a member of MAAWG and recommends that you adhere to MAAWG’s sending best prac...

  Road Runner High Speed Online started in 1995 under the Time Warner Cable (TWC) company umbrella, delivering internet access services during the early days of the Internet. In 2012, the Road Runner brand name was retired and replaced with the Ti...

Although AT&T uses the Yahoo email infrastructure, when your email makes it through the AT&T gateway, it is still subject to spam filtering and may experience delivery problems. Most of the time, your email performance at AT&T should be similar to...

AT&T, Bellsouth, and SBC use the Yahoo email infrastructure to filter messages. The receiving Mail Transfer Agent (MTA) is located within AT&T's network. Messages accepted at the gateway by AT&T servers are relayed to the Yahoo anti-spam filters, ...