請教各位前輩, 我們公司寄信給某單一個客戶一直寄不出, 躺在佇列裡, 出現錯誤如下
4.4.1 Error encountered while communication with Primary target IP address.
4.4.2 Connection dropped due to connectionReset. Attempted failover to alternate host, but that did not succeed. Either there are no alternate.
請教各位前輩, 這有可能是什麼原因造成? 該由何處查起呢? 請各位大大幫忙, 感激不盡...