Usage of smtp-tester:
-debug
show debug logs
-from string
Envelope from sender address
-header-from string
Header from sender address, if empty defaults to --from
-max-mails uint
Limit the amount of emails, 0 means no limit
-password string
SMTP server password
-reuse-smtp
Reuse SMTP connection
-show-error
show error type on auth failure
-size uint
Message size in bytes (default 30720)
-smtp-host string
SMTP server address
-starttls
whether to require StartTLS (default true)
-subject string
Email subject (default "hello")
-threads uint
Whether to run an infinite loop with an amount of threads
-timeout uint
Timeout in seconds (default 3)
-to string
Recipient address
-username string
SMTP server username