dns 服务器:人们习惯记忆域名,但机器间互相只认ip地址,域名与ip地址之间是一一对应的,它们之间的转换工作称为域名解析,域名解析需要由专门的域名解析服务器来完成,域名解析服务器即是 dns 服务器。
dns在很多群发软件中的作用是寻找接收邮件的服务器,如果您的机器是直接连上 internet 的,很多群发软件会自动寻找,即使不是,软件中一般也附带了几个 dns 服务器,您可以不对此作任何设置。如使用的是不能自动寻找而软件中也没有附带dns服务器地址的群发软件,可向当地internet服务提供者询问。
18、dns服务器设置技巧。
群发时经常显示发送失败,原因:received packet is too small. less than 4 bytes 28 。遇到这样的情况一般都是dns设置不正确,下面以科特群发软件举例说明正确设置方法:
500 syntax error, command unrecognized [this may include errors such as command line too long] 501 syntax error in parameters or arguments 502 command not implemented 503 bad sequence of commands 504 command parameter not implemented 211 system status, or system help reply 214 help message
[information on how to use the receiver or the meaning of a particular non-standard command; this reply is useful only to the human user] 220 <domain> service ready 221 <domain> service closing transmission channel 421 <domain> service not available, closing transmission channel [this may be a reply to any command if the service knows it must shut down] 250 requested mail action okay, completed 251 user not local; will forward to <forward-path> 450 requested mail action not taken: mailbox unavailable [e.g., mailbox busy] 550 requested action not taken: mailbox unavailable [e.g., mailbox not found, no access] 451 requested action aborted: error in processing 551 user not local; please try <forward-path> 452 requested action not taken: insufficient system storage 552 requested mail action aborted: exceeded storage allocation 553 requested action not taken: mailbox name not allowed [e.g., mailbox syntax incorrect] 354 start mail input; end with <crlf>.<crlf> 554 transaction failed。