Spamming is a crime against the spirit of the Internet.
The trouble with quotes about spam is that you never know if they are genuine.

Spam is for those who can't think of anything intelligent to say.
Spam is like a virus; the more it spreads, the more damage it does.

Spam is a reality of the digital age, but it doesn't have to be a way of life.
Spam is like a virus, infecting everything it touches.
The only way to deal with spam is to ignore it and move on.
Spam is a sign of a lack of respect for your audience.
Spam is just the tip of the junk mail iceberg in the digital sea.

Spam is the trash of the digital world, cluttering the information highway.
Spam is a waste of the receivers' time, and it is a waste of the sender's optimism.