Hi Jackie, I’d like to confirm some information to better understand the situation: 1. What does the “a/c” you mentioned refer to? Normal end users in your company? 2. Regarding “cannot receive one customer email”, can you receive emails from other customers normally? 3. Can the customers send emails to other companies except your company normally? 4. From the error message you provided, the issue might be related to the network environment. If the customer can send emails to other companies normally, it means the network environment of the customer is fine. In this scenario, please improve the network environment quality of your company or change for another network environment to see if the issue persists. Your time and efforts are highly appreciated. Best regards, Mouran
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