poll, peek or remove */// 下一个移除的元素的索引,代指队首int takeIndex;/** items index for next put, offer, or add */// 下一个添加的元素的索引,代指队尾int putIndex;/** Number of elements in the queue */// 当前队列中的元素数量int count;/* ...
if you botch (typo) the relayhost parameter, the mail will be undeliverable. The first thing to do is fix the problem, meaning get the network back online, or fix the configuration.
It’s frustrating to find out an important email was “queued” by Gmail and hasn’t arrived in your recipient’s inbox. Learn these strategies to avoid any more queued emails.