If you receive an error message saying "550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked," it means that Google's spam filters have detected your email as potentially unsolicited or unwanted. This can happen for a variety of reasons, such as if your email contains certain keywords or phrases that are commonly used by spam emails, or if your email address is not on the recipient's contact list.
To reduce the likelihood of your emails being marked as spam, there are a few things you can do:
- Make sure that you are only sending emails to people who have explicitly opted in to receive emails from you. This can help ensure that your emails are not marked as spam because they are being sent to people who did not request them.
- Avoid using keywords and phrases that are commonly associated with spam emails, such as "earn money fast" or "limited time offer." Instead, use language that is clear, concise, and relevant to the recipient.
- Include your contact information and a physical address in the footer of your emails. This can help demonstrate that your emails are legitimate and not spam.
- Use a professional email service provider that has robust spam filters and protections in place. This can help ensure that your emails are delivered to the recipient's inbox and not marked as spam.
If you continue to have issues with your emails being marked as spam, you can contact Google support for assistance. They can help you diagnose and resolve the issue, and ensure that your emails are delivered to the recipient's inbox.