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The GTUBE ("Generic Test for Unsolicited Bulk Email") is a 68-byte test string used to test anti-spam systems, in particular those based on SpamAssassin. In SpamAssassin, it carries an anti-spam 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 5322 compliant email message, without any line breaks or whitespace.

Checksums for the string (68 bytes, no trailing newline) are as follows:

There exist some varieties, 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.

See also

EICAR test file

References

1. "SpamAssassin: The GTUBE". spamassassin.apache.org. Retrieved 2023-07-13.
2. "How to generate test messages for Email Gateway anti-spam testing". McAfee. 2019-12-16. Archived from the original on 2020-11-01.
3. "McAfee Support Community - What is Threat Type: Test". McAfee. 2013-06-07.

Bibliography

• "SpamAssassin: The GTUBE". The Apache Software Foundation.

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