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（sendmail问题）hosts已设置，但无法解析sendmail已经设置好，mail -v 测试sendmail正常，但是向外发送（[url=mailto:abc@xxx.com]abc@xxx.com[/url]）收不到邮件，查看/etc/log/maillog有如下记录：
QUOTE:
Mar 12 17:42:13 host-a sendmail[27870]: l2C9gDut027870: from=root, size=72, class=0, nrcpts=1, msgid=, relay=root@localhost
Mar 12 17:42:13 host-a sendmail[27872]: l2C9gDEJ027872: from=, size=377, class=0, nrcpts=1, msgid=, proto=ESMTP, daemon=MTA, relay=host-a [127.0.0.1]
Mar 12 17:42:13 host-a sendmail[27874]: l2C9gDEJ027872: to=, ctladdr= (0/0), delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=30377, relay=xxx.com., dsn=4.0.0, stat=Deferred: Name server: xxx.com.: host name lookup failure
Mar 12 17:42:13 host-a sendmail[27870]: l2C9gDut027870: to=abc@xxx.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30072, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (l2C9gDEJ027872 Message accepted for delivery)
在maillog日志中发现“host name lookup failure”记录，但是在/etc/hosts中已经做了静态解析:
QUOTE:
[root@host-a var]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1 host-a localhost.localdomain localhost
xx.xx.xx.xx xxx.com mail
疑惑的是用nslookup解析不出xxx.com，但是能telnet xxx.com 的25端口：
QUOTE:
[root@host-a var]# nslookup mail
;; connection timed out; no servers could be reached
[root@host-a var]#
[root@host-a var]# telnet xxx.com 25
Trying xx.xx.xx.xx...
Connected to mail (xx.xx.xx.xx).
Escape character is '^]'.
220 SMTP Proxy Server Ready
为什么telnet能进入25端口，而nslookup错误而且日志报解析错误？请各位高手指点是哪里出了问题？小弟实在弄不明白，谢谢
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