IS THERE A FILTER TO BLOCK CYRILLIC WITH THUNDERBIRD

A nslookup is an IP networking utility that can query the domain name service to find out what IP address is associated with a given host name or vice-versa.
On some operating systems, the similar command "host" is preferred.
The term spam is used for a number of things these days.
Spamassassin: An open-source spam filtering system currently maintained by the apache software foundation, and used by many small-to-medium-size isps, online businesses, and end-users.
orgSpamassassin is typically run on a mail delivery agent so that spam can be held and not downloaded to the user.
Usually some desperate yet misguided individual who has bought some spamware and is under the completely wrong impression that money can be made from spamming.
Microsoft Exchange: Part of the Windows Server line of products Exchange is a collaborative software product which handles email, calendars and daily tasks amongst other things.
An immigration law firm in arizona is popularly described as sending the first intentional, mass commercial email advertising their services over usenet in 1994.
This event is commonly referred to as the 'green card spam'.
A Tagged Address is an email address that is unique in some way so that the owner can keep track of who has it.
A mailback script is a web automation program designed to collect messages from website visitors (via an HTML form) and deliver them privately via e-mail.
Formmail is one of the more popular programs, but there are many others.