How to archive a folder in parts and send it to the mail (different)?

Question

Automation

Good day.
There is a task to archive (WinRAR) a certain folder with the division of archives into N megabytes, with a password and to a changing email address.

An example of how it happens now:
A folder with documents 15Mb, archived by WinRAR with a password and into volumes of 5Mb
Create 3 letters in Outlook 2013-2016, attach a part of the archive, Write a greeting and how many parts of the archive you plan to send.

Folder that is archived - different
Password - changes (there are several options)
Volume size - does not change

WinRar can send to mail - but the letter contains only an attachment, without a

description

Answer 1

Write your own script (.bat or .ps) in which to launch archiving and sending mail.
You can send via blat or Send-MailMessage

Answer 2

Sending archives to the mail is the worst form of data transfer, is it really impossible to do it differently?
To automate means to write an application, there are 100500 options, take it, it's not difficult.
Here 's an example of how to send mail with attachments using PowerShell