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Correctly Configure Your Server:
- Ensure your server settings are properly configured with the necessary DNS records, including RDNS, SPF, and DKIM. These are critical for authenticating your emails and preventing them from being marked as spam.
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Verify Your Configuration:
- Use MXToolbox to check your server's DNS, MX records, and other configurations: https://mxtoolbox.com/MXLookup.aspx.
- Ensure that your server’s IP address is properly mapped to your domain name (PTR record) to avoid issues with mail delivery.
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Test Your Emails:
- Send a test email to Mail-Tester to get a detailed report on how your email is likely to be treated by spam filters: https://www.mail-tester.com.
- Review the report carefully and make any necessary adjustments to improve your email score.
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Follow Email Sender Best Practices:
- Review and adhere to the Email Sender Guidelines provided by Google: https://support.google.com/a/answer/81126.
- Ensure that your email content is clean, avoid spammy keywords, and include proper unsubscribe links. Also, maintain a healthy mailing list by regularly cleaning it from inactive or invalid addresses.
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Monitor Your Server IP for Blacklisting:
- Regularly check your server IP on blacklists using tools like BlacklistAlert: https://blacklistalert.org and MXToolbox: https://mxtoolbox.com/blacklists.aspx.
- Action Required: If your IP is listed on any blacklist, take immediate action to resolve the issue. This may involve reviewing and stopping any potentially harmful activities, such as sending unsolicited emails, and contacting the blacklist administrators for delisting.
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Limit Daily Email Volume:
- Be mindful of the number of emails sent per day. Overloading your server with too many outgoing emails can lead to IP throttling or blacklisting.
- Regularly check the number of rejected emails using SenderScore: https://senderscore.org. A high rejection rate can indicate issues with your email practices, such as sending to outdated lists or having low engagement.
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Maintain a Healthy Sender Reputation:
- Consistently monitor your sender reputation, as it plays a crucial role in email deliverability. A low reputation can lead to your emails being flagged as spam or rejected by recipient servers.
- Use services like Google Postmaster Tools or Microsoft SNDS to get insights into how ISPs view your emails and address any issues promptly.
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Implement a Feedback Loop:
- Subscribe to feedback loop services from major ISPs (e.g., Gmail, Yahoo) to receive reports on complaints generated by your emails. This allows you to identify and remove problematic addresses from your mailing list.
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Ensure Server Security:
- Secure your server to prevent unauthorized access and misuse, such as being exploited for spam campaigns. Regularly update your server software, use strong passwords, and implement firewalls to safeguard against security threats.
