For several years, Apple customers have used some still use email from the domain @ mac.com. In 2011, Ma started a migration to @ me.com (from the late MobileMe), automatically making this change for users who updated their iOS devices to version 4.1 of the system. With the introduction of iCloud, the following year, another change was made, this time moving users to the current domain @ icloud.com.
Although many users have abandoned their accounts, the portion that keeps them active did not tend to face many problems with sending and receiving messages from these domains, at least until recently. After a silent update, Apple changed the authenticity of emails sent by these accounts through third-party servers (such as Gmail and Outlook), according to policy DMARC, adopted by Ma and other companies.
According to SendGrid, a security and email solution company, updates like this will continue to occur on several servers, as major online providers try to prevent senders from sending messages through the domain of other companies.
In practice, as published by expert Al Iverson on the blog Spam Resource, the accounts @ icloud.com, @ me.com and @ mac.com are now registered under the DMARC p = quarantine domain. As a result, messages sent by these accounts can stop reaching the recipients' inboxes and fall into the spam box even though the sender and recipient have already exchanged several emails before.
This was the problem faced by the editor of MacRumors Joe Rossignol, who said he did not notice the change until one of his recipients alerted him that his email was sent to spam. Until then, Rossignol used Gmail to receive and send messages from his @ me.com account. After finding out what it was about, he sought clarification from Apple, which despite not officially confirming the new policy, pointed out some possible solutions to the problem with third-party servers. Among these, it is necessary to make sure that the accounts @ mac.com, @ me.com and @ icloud.com are configured to send emails through iCloud's SMTP servers, check out these tips to set up your account properly.
Although it is a functional solution, it is not yet known how effective this option is in preventing new emails from being sent to the recipient's spam box. So, another, simpler solution, set up your email account with the Mail app, native to iOS and macOS, or start your session on iCloud.com.
Although relatively complex, the positive step towards preventing the spread of spam and also attacks by phishing, as it becomes increasingly difficult for cybercriminals to use these domains as a weapon for online attacks.