The MacSonik EML Converter is an excellent option for you. Rather than manually moving your email accounts to your IMAP server, this one utility allows you to move all your EML files directly to your IMAP server. Your email formatting, folders, and attachments are stored safely. In addition to that, you can also filter your emails with a variety of parameters (i.e. by date, sender, subject, or only specific messages). It supports the bulk import of many EMLs to IMAP servers all at once with zero hassle. Overall, this is the fastest and easiest way that you will find to migrate your email accounts to the IMAP interface while keeping everything in order.

Instructions on How to Import EML File to an IMAP Server
1. First, download and complete the installation of the MacSonik EML converter tool on your system.
2. Next, click on the Select EML files/folder option and load the data you would like to import.
3. At this point, you can preview the emails and folders you selected in a panel, then select Next.
4. Then, from the email application options select IMAP as the option to save your email.
5. Now, enter your IMAP email details (valid Email, password, IMAP Host, and port).
6. Optionally, you can apply filter options such as date range, or other parameters to limit your export.
7. Finally, select the Convert button to initiate the EML email to IMAP migration.

Know more: https://www.linkedin.com/pulse/how-import-eml-files-imap-server-quick-ways-macsonik-londf