EML files are commonly used to store individual email messages, but managing a large collection of them on a Mac can become difficult. This is especially true when emails have been collected from different applications or exported as backups. Instead of having hundreds or thousands of separate EML files scattered across folders, it can be useful to organize or convert them into a format that fits your current email workflow.

The first thing to determine is where you want the emails to go. If you need to continue working with them in an email client, formats such as MBOX, EMLX, MSG, or PST may be more suitable depending on the destination. If the objective is simply to keep emails for reference, PDF or HTML can be more convenient.

For a large collection, manually opening every EML file isn't practical. A better approach is to look for software that can add individual files or an entire folder and then process them in bulk. Folder hierarchy is also important because it can help preserve the way the original emails were organized.

Another thing to consider is attachments. An EML message may contain important documents, images, or other files. During conversion, you should check whether the software can preserve attachments and whether it allows them to be saved separately when required.

SysInfo Mac EML Converter provides options to add individual EML files or folders and convert them into formats such as PST, MBOX, PDF, MSG, HTML, and EMLX. The product page also states that the software can preserve the original folder hierarchy and save attachments to a designated folder.

Filtering can make the process easier when you don't need every message. The software includes a date-range filter, allowing users to select emails from a particular period rather than processing the entire collection. It also provides options for identifying duplicate emails using criteria such as sender, recipient, subject, and body.

For users who need to extract information rather than convert complete messages, another useful option is extracting email addresses, phone numbers, and URLs from EML files into CSV or XLSX files.

So, if you're dealing with a large EML collection on Mac, the best approach is to first decide the required destination, check attachment and folder requirements, filter unnecessary messages, and then perform the conversion in batches. This makes the process more organized than handling each EML file manually.