Microsoft it has been confirmed that Gmail's considers to be some of the emails to be sent from the account of the Outlook, as well as unwanted pregnancies. The problem affects only the users who are using the details of the national domain to the level of the higher. Blocking is almost certainly due to the guidance of the new, presented by Google in order to reduce the messages and unwanted pregnancies.
Microsoft does not comply with the rules of Google
Some users of Outlook, they get an automatic response from the servers of Google, informing that the email has not arrived in your inbox of the recipient because it was considered suspicious. Gmail has been discovered that the domain of the sender, he has a reputation to be very low. In practice, however, the message is blocked because it's considered spam.
Microsoft has provided a temporary solution. The user must add an alias to an account in their Outlook, and you use it to send emails to the user of Gmail.
Almost certainly, the blocking is due to non-compliance with the minimum requirements laid down by the guidelines announced by Google in October 2023, and in effect from February 1, 2024, with respect to the sender, to deliver more than 5000 emails per day. For domains, you must become active methods when the SPF/DKIM and chat support DMARC.
Google says that starting in April it will be the start of the block down to the emails from domains that do not meet the minimum requirements. In essence, what happened to some of the users the Outlook.
The guidelines will be applied strictly by the expert in order to prevent the introduction of the post of the unwanted in-box access to your Gmail. So, Microsoft should agree to within a couple of months ago.
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