This is the GTUBE -- the Generic Test for Unsolicited Bulk Email.

If your spam filter supports it, the GTUBE provides a test by which you can verify that the filter is installed correctly and is detecting incoming spam, in a similar fashion to the EICAR anti-virus test file.

Spam filter developers should add a rule, where possible, to recognise the following 68-byte string in the message body, and trigger on it:

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

Note that this should be reproduced in one line, without whitespace or line breaks. A suitable mail message in RFC-822 format can be downloaded here.

This string and mail can be reproduced freely, without attribution; they are hereby placed in the public domain.