The GTUBE (Generic Test for Unsolicited Bulk Email) is a test string used to test anti spam solutions, notably those based on spamassassin. It is a 68 byte string, and by default it carries an antispam score of 1000, which would be sufficient to trigger any installation. Spam may refer to: Spam (food), a brand of canned meat sold by Hormel. ... SpamAssassin is a computer program released freely under the Apache License 2. ...

The contents of the string are as follows:

XJS*C4JDBQADN1.NSBN3*2IDNEN*GTUBE-STANDARD-ANTI-UBE-TEST-EMAIL*C.34X

And should be placed in the message body of a RFC822 compliant email message, without any linebreaks or whitespaces. E-mail, or email, is short for electronic mail and is a method of composing, sending, and receiving messages over electronic communication systems. ...

Note that there exist some varieties that might not be recognized by all filters, notably the NAItube (which will carrie a variable weight) and the GTphish (which will trigger specifically as a phishingmail), which are used in the Mcafee implementation of spamassassin. Phish was an American rock band most noted for its extended jams and unique improvisation. ... McAfee, Inc. ... SpamAssassin is a computer program released freely under the Apache License 2. ...

Source: http://spamassassin.apache.org/gtube/