sendmail：SMTP主机名称查找失败

我还没有对sendmail进行任何更改，现在由于这个错误（我使用我的ISP SMTP服务器）而无法发送任何电子邮件：

Jan 28 10:34:36 zenorebirth sm-mta [3225]：p0S9htol031342：[email protected]，delay = 05：50：00，xdelay = 00：00：00，邮件程序=继电器，pri = 17278301，relay = smtp-server.nycap.rr.com，dsn = 4.0.0，stat = Deferred：名称服务器：smtp-server.nycap.rr.com：主机名称查找失败

我可以远程login到smtp-server.nycap.rr.com并从Linux机器发送邮件就好了。 debugging信息：

# sendmail -v -d8.20 -qIp0SFnrG2009232 Running /var/spool/mqueue/p0SFnrG2009232 (sequence 1 of 1) dns_getcanonname(zeno.biyg.org, trymx=1) dns_getcanonname: trying zeno.biyg.org. (A) YES dns_getcanonname: zeno.biyg.org dns_getcanonname(biyg.net, trymx=1) dns_getcanonname: trying biyg.net. (A) YES dns_getcanonname: biyg.net getmxrr(smtp-server.nycap.rr.com, droplocalhost=1) getmxrr: res_search(smtp-server.nycap.rr.com) failed (errno=110, h_errno=2) <[email protected]>... Deferred: Name server: smtp-server.nycap.rr.com: host name lookup failure 

也：

• sendmail规则来过滤垃圾邮件
• 我如何收到邮件发送给邮件pipe理员？
• 我可以使用哪个邮件日志分析器作为sendmail？
• 首次configurationsendmail
• 从DynDNS（子）域发送Postfix邮件

 # echo "/map host smtp-server.nycap.rr.com" | sendmail -d8.20 -bt ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter <ruleset> <address> > map_lookup: host (smtp-server.nycap.rr.com) dns_getcanonname(smtp-server.nycap.rr.com, trymx=1) dns_getcanonname: trying smtp-server.nycap.rr.com. (A) YES dns_getcanonname: smtp-server.nycap.rr.com returns smtp-server.nycap.rr.com. (0) > 

sendmail.cf：http://pastebin.com/uXxZCZwS

 getmxrr(smtp-server.nycap.rr.com, droplocalhost=1) getmxrr: res_search(smtp-server.nycap.rr.com) failed (errno=110, h_errno=2) <[email protected]>... Deferred: Name server: smtp-server.nycap.rr.com: host name lookup failure 

 Non-authoritative answer: Name: smtp-server.nycap.rr.com Address: 75.180.132.33 nslookup > set q=ptr > 75.180.132.33 Non-authoritative answer: 33.132.180.75.in-addr.arpa name = cdptpa-omtalb.mail.rr.com.