You can use any of those (and others), but Email::Send::Gmail looks very easy to use.
I'd say look at the usage examples then pick one you like.
Update: Email::Send::SMTP::Gmail looks like it might be a better choice as it appears to have been updated 2016-Oct-10 (as of this update to this post).
In reply to Re: Sending mails via gmail
by RonW
in thread Sending mails via gmail
by morgon
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