Jenkins SMTP connection refused. What am I missing?

FWIW The nobody@nowhere address is the default address Jenkins comes with for the system admin email address (which is used as the from address when sending emails)

you can change it at

Manage Jenkins > Configure System > Jenkins Location

first, use port 465

second, get your email verified in AWS SES, and change your default sending email from here: Jenkins -> Configure System -> Jenkins Location -> System Admin e-mail address