What are the package for Mail.dll?
You can download the dll and try it for as long as you want:
https://www.limilabs.com/mail/download
Download is fully functional. It has the same features as the registered version. However it changes the subject of some emails to "Please purchase a license" message and shows a message box.
To remove this limitation you need to get a license:
https://www.limilabs.com/mail/purchase
How much is the cost?
It depends on the license type and support period.
You can find all details here:
https://www.limilabs.com/mail/help
Some summary:
The component is licensed on per developer basis.
You have to obtain a valid license for each human, who writes the code which directly uses the component.
EUR 149 for 1 year support and EUR 199 for 2 years support. Bulk licenses (4 and more) are cheaper (EUR 99 and EUR 124 per license)
You can also purchase company license without developer limit.
You can find all prices (also in USD) here:
https://www.limilabs.com/mail/purchase
And What will be the process of your support.
Email (we answer emails quite fast) and this Q&A forum.