pendanticist wrote:

whois -h 61.135.132.77 failed, (no such host)

whois -h whois.apnic.net 61.135.132.77 ...
% [whois.apnic.net node-1]
% Whois data copyright terms [apnic.net...]

inetnum: 61.135.0.0 - 61.135.255.255
netname: CHINANET-BJ
descr: CHINANET Beijing province network
descr: Data Communication Division
country: CN
admin-c: DK26-AP
tech-c: SY21-AP
mnt-by: MAINT-CNCGROUP
mnt-lower: MAINT-CHINANET-BJ
changed: hostmaster@ns.chinanet.cn.net 20000701
status: ALLOCATED NON-PORTABLE
source: APNIC

person: Dongmei Kou
nic-hdl: DK26-AP
e-mail: dmkou@publicf.bta.net.cn
address: No.156,Fu-Xing-Men-Nei Street,Beijing,100031
phone: +86-10-66429796
fax-no: +86-10-66429794
country: CN
changed: dmkou@publicf.bta.net.cn 20030710
mnt-by: MAINT-CNCGROUP
source: APNIC

person: sun ying
address: Beijing Telecommunication Administration
address: TaiPingHu DongLi 18, Xicheng District
address: Beijing 100031
country: CN
phone: +86-10-66198941
fax-no: +86-10-68511003
e-mail: suny@publicf.bta.net.cn
nic-hdl: SY21-AP
mnt-by: MAINT-CHINANET-BJ
changed: suny@publicf.bta.net.cn 19980824
source: APNIC

Interesting. This is kind of a leap here, but I read in the last day or so that China banned tons of spam type web sites. Perhaps this came to your site from China looking for e-mail addresses, and by the time you pinged it, China had taken it down. Like I said, a leap.