Summary
isdn.net.s5b1.psmtp.com has one IP number , which is the same as for
net.s5b1.psmtp.com, but the reverse is
s5b1.psmtp.com.
ca.s5b1.psmtp.com,
de.mail3.psmtp.com,
uk.mail3.psmtp.com,
edu.s5b1.psmtp.com,
org.s5b1.psmtp.com and at least 100 other hosts point to the same IP.
nxs.net,
lrn.net,
wkvl.com,
nsrca.us,
isdn.net and at least 67 other hosts use this as a mailserver.
isdn.net.s5b1.psmtp.com is hosted on a server in United States.