Using thunderbird for sending emails over command line

Question

When I receive orders I handle them in an admin tool. When processed, I launch thunderbird with command line, so it opens up email windows with prefille subject, to, from, body and file attachment.

I use thunderbird because it gives me extra documenation, backup and ease that I can see and search order emails in my email program when I handle customer inquiries.

I am now trying to fully automate my order processing, so it will work when I am away at holiday etc. without having someone to handle orders for me.

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I have two problems:

1)

Thunderbird always asks me if I want to swich to online mode. I usually prefer to be asked, but when used over commandline I would the switch to happen automatically.

2)

Currently I need to press the "Send" button myself. I would like the email sent automatically as well.

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Is what I am hoping for impossible? I would prefer using thunderbird as my "hub" simply because I like having all my emails sent together.