Spam sender, e.g

• Spammer, e.g.
• Screen writer?
• One whose letters are screened?
• Spam supplier, e.g
• At end of race, Bannister, say, hugging a communicator?
• Spammer, e.g
• Spam distributor
• One may attach something

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