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Export IMAP Data into Mbox and EML from Particular Folder

Export IMAP data into mbox in single or mulitple folders selection and also get particular selected folders or subfolders emails…provide solution for mbox and eml
Platform C#

Thank you for posting the query. I will prepare this information for you and reply as soon as possible.

You can fetch email messages using an ImapClient class instance as shown below:

var messageInfos = imapClient.ListMessages("FolderName");
foreach (var messageInfo in messageInfos)
    var mailMessage = imapClient.FetchMessage(messageInfo.UniqueId);

An email message can be written to an Mbox file like this:

using (var mboxWriter = new MboxrdStorageWriter("test.mbox", false))

More examples:
Working with Messages from IMAP Server
Programming with Thunderbird

API Reference:
ImapClient Class
MboxrdStorageWriter Class

                var messageInfos = imapClient.ListMessages("Sent"); 

this not working for gmail…please provide solution for subfolders to get emails

To fetch email messages from predefined folders, please use ImapMailboxInfo class as shown below:

var sentFolderName = imapClient.MailboxInfo.SentMessages.Name;
var messageInfos = imapClient.ListMessages(sentFolderName);

Documents: Working with Folders on IMAP Server
API Reference: ImapMailboxInfo Class