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For spam reasons, also plain text also takes up a lot less bandwidth than HTML when sending out a lot of replies.
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HTML has a higher chance of being flagged as spam and in the world of newsletters, delivery rate is the name of the game.
several reasons for this , if a user really interact on topic he really putting a good comments.
- Spam commenting
- Bulk Link submission
- pagerank sculpting
- Easy light weight page processing
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