I just found this rule in SA 1.6 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (alv.john2[at]gmail.com)
What's the rationale? Many FreeMail users end up having a digited username, as the wanted username is reserved. How is it a sign of spamminess? Some put their birth year or age after the name, others just random numbers. -- http://www.iki.fi/jarif/ Try to have as good a life as you can under the circumstances.
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