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Re:Avoiding Spam with Email Aliasing by vsviridov on Tuesday December 17, 2013 @10:59PM (#6925809)
Too much effort. They mostly go for fire-and-forget strategy. Any additional processing time means less sent emails = less profit.
Re:Avoiding Spam with Email Aliasing by joosters on Tuesday December 17, 2013 @11:41PM (#6925948)
What? It's minimal effort. 'Found' a gmail address? Drop everything after the + sign.

Spammers spend a lot of processing time on their emails (e.g. testing them against spam filters to tweak them to get through), so this extra step is so small as to be insignificant.