更值得关注的是 DNS 方面，其中名称服务器可能会保留最近解析的条目的缓存。这意味着，即使您更改了 MX 条目（例如，在负责 DN 区域的注册商处），它们在您的邮件服务器上可能看起来没有变化，具体取决于解析 MX 记录的 DNS 服务器的 TTL。
postqueue -f will flush the queue made of files, that process can be done even after a reboot, and, like an automate, all resolution and contacts steps are done again.
In brief, it repeats the process if name resolution via, first, the MX type entries, and tries (again) to contact the targeted mail servers.
The concern would be more on the DNS side, where the name server may keep a cache of the recently resolved entries. Meaning that even if you change the MX entries (at a registrar in charge of your DN zones for instance), they may seem unchanged from your mail server, depending on the TTL of the DNS server that resolved the MX record.
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postqueue -f 将刷新由文件组成的队列，即使在重新启动后也可以完成该过程，并且像自动化一样，所有解析和联系步骤都会再次完成。
简而言之，如果首先通过 MX 类型条目进行名称解析，它会重复该过程，并尝试（再次）联系目标邮件服务器。
更值得关注的是 DNS 方面，其中名称服务器可能会保留最近解析的条目的缓存。这意味着，即使您更改了 MX 条目（例如，在负责 DN 区域的注册商处），它们在您的邮件服务器上可能看起来没有变化，具体取决于解析 MX 记录的 DNS 服务器的 TTL。
postqueue -fwill flush the queue made of files, that process can be done even after a reboot, and, like an automate, all resolution and contacts steps are done again.In brief, it repeats the process if name resolution via, first, the MX type entries, and tries (again) to contact the targeted mail servers.
The concern would be more on the DNS side, where the name server may keep a cache of the recently resolved entries. Meaning that even if you change the MX entries (at a registrar in charge of your DN zones for instance), they may seem unchanged from your mail server, depending on the TTL of the DNS server that resolved the MX record.