GTUBE

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The GTUBE (Generic Test for Unsolicited Bulk Email) is a 68 byte test string used to test anti spam solutions, notably those based on spamassassin. In spamassassin, it carries an antispam score of 1000 by default, which would be sufficient to trigger any installation.

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 an RFC 2822 compliant email message, without any linebreaks or whitespaces.

Note that there exist some varieties that might not be recognized by all filters, notably the NAItube (which will carry a variable weight) and the GTphish (which will trigger specifically as a phishing mail), which are used in the McAfee implementation of spamassassin.