Mail Error: Reason: Error in sieve filter is the error that many users have iCloud I receive it this morning when trying to send an email through Apple's service and the problem seems to be with the American company. For now, Apple has not updated its page listing the status of iCloud services, but it will probably do so soon, considering that many people have started to complain about the email service. Users receive an error email from Apple when they try to send emails, but they can receive messages from other people without problems, and a thread from the company's forum proves that not a few people have problems.
Unfortunately, there is absolutely nothing you can do to fix the error, so you just have to wait until Apple engineers fix everything.
