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FAQ
Customers say they sent an email but we didn't receive it, why?
- Şanlısoy
- 15/03/2026 14:15
Why Don't Emails Arrive? Common Causes
It's quite common for customers to say they sent an email but it never reached you. The root cause of this issue is usually that the sender's mail server or domain is listed on global spam blacklists. Major providers like Gmail, Yahoo, and Outlook automatically route emails from IPs with bad reputations to spam folders or block them entirely. This can happen without the sender's knowledge.
Blacklist systems (RBL - Real-time Blackhole List) track spam-sending IP addresses and domains in real-time. If your customer's mail server is on these lists, their emails are rejected by target servers. Even though the sender sees a 'mail sent' confirmation, it never reaches the recipient. This technical issue is particularly common with corporate mail servers.
Quick Solution: Whitelist Optimization
The fastest and most effective solution to this problem is adding the sender's email address or domain to the whitelist. A whitelist allows your mail server to recognize specific addresses as trusted and bypass all security filters. At Şanlısoy, in our server management services, we instantly detect such technical issues and perform whitelist optimization to prevent communication interruptions.
Whitelist configuration not only solves the current problem but also guarantees future communication. Proper configuration of SPF, DKIM, and DMARC records protects your mail reputation and minimizes the risk of blacklisting. Regular blacklist monitoring and whitelist management are critical for your mail infrastructure health. You can leave these processes to our technical team with professional support.
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