Emails being marked as spam are usually related to domain reputation, IP reputation, and mail server configuration. Please troubleshoot according to the following steps:
1. Check Whether the Domain Is Blacklisted
If the sending domain has a history of spam-related records, recipient servers may block the emails or classify them as spam.You can use the following tool to check the domain reputation:https://mxtoolbox.com/blacklists.aspx
2. Check Whether the Dedicated Sending IP Is Blacklisted
If the dedicated sending IP has previously been used for spam activities, emails may be rejected, bounced, or sent to spam folders.You can use the following tool to check the IP reputation:https://mxtoolbox.com/blacklists.aspx
3. Confirm Whether PTR Records Are Configured
PTR reverse DNS records are critical identity authentication items for mail servers. Missing or incorrect PTR configurations are highly likely to result in emails being identified as spam.Use the following tool to verify whether the PTR configuration has taken effect:https://dnschecker.org/reverse-dns.php
4. Verify Whether the PTR Domain Matches the Email Sending Domain
The domain bound to the PTR record should match the actual sending domain used by the Enterprise Mailbox service. Otherwise, the credibility of the emails may be reduced, affecting deliverability.
Kind Reminder:
• Emails going to spam are usually caused by multiple factors. It is recommended to troubleshoot step by step;
• DNS and PTR configurations may take time to propagate. Please wait for a while before retesting after configuration;
• It is recommended to also configure SPF, DKIM, and DMARC email authentication to further improve deliverability.You can use the following comprehensive testing tool:
https://www.mail-tester.com/
