Spammer, e.g

• Spam distributor
• Marketing software
• Contemporary correspondent
• Online correspondent
• Spam supplier, e.g
• Spammer, e.g.
• One whose letters are screened?
• English novelist, who doesn't use a pen?
• Sender of high-tech letters

Wiktionary Word definitions in Wiktionary
n. One who, or that which, sends an email.