true "ssl" argument to Email::Sender::Transport::SMTP should be 'ssl' or 'startls' or '1' but got 'maybestarttls'

[KES777]

The documentation has this line:

ssl: if 'starttls', use STARTTLS; if 'ssl' (or 1), connect securely; if 'maybestarttls', use STARTTLS if available; otherwise, no security

But from error message I can understand that maybestarttls is not supported.

Should we fix documentation?

my options are:

transport =>  '+SMTP::Persistent',
port      =>  '587',
ssl       =>  'maybestarttls',