e371f003_liverability___Act_On_Software__Are_You_a_Legitimate_Mailer_
Spammers use “cute” spellings, S.P.A.C.E out their words, and put str@nge |etters 0r characters into their emails. [Are You a Legitimate Mailer?] 
Use normal conversational language. Don’t use excessive spacing and/or capitalization in your subject line.
Best Practices in Email Deliverability - Act-On Software
Are You a Legitimate Mailer?