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May 26, 2013

MailCore 2: Introduction

MailCore 2 provides a simple and asynchronous Objective-C API to work with the e-mail protocols IMAP, POP and SMTP. The API has been redesigned from the ground up. It features:

  • POP, IMAP and SMTP support
  • RFC822 parser and generator
  • Asynchronous APIs
  • HTML rendering of messages
  • iOS and Mac support

Build Status

Installation

Build for iOS/OSX

Read instructions for iOS/OSX.

Build for Android

Read instructions for Android.

Build for Windows

Read instructions for Windows.

Build for Linux

Read instructions for Linux.

Basic IMAP Usage

Using MailCore 2 is just a little more complex conceptually than the original MailCore. All fetch requests in MailCore 2 are made asynchronously through a queue. What does this mean? Well, let's take a look at a simple example:

  let session = MCOIMAPSession()
  
  session.hostname       = "imap.gmail.com"
  session.port           = 993
  session.username       = "ADDRESS@gmail.com"
  session.password       = "123456"
  session.connectionType = .TLS
  
  let folder = "INBOX"
  let uids   = MCOIndexSet(range: MCORange(location: 1, length: UInt64.max))
  
  if let fetchOperation = session.fetchMessagesOperation(withFolder: folder, requestKind: .headers, uids: uids) {
    fetchOperation.start { error, fetchedMessages, vanishedMessages in
      // We've finished downloading the messages!
      
      // Let's check if there was an error
      if let error = error {
        print("Error downloading message headers: \(error.localizedDescription)")
      }
      
      // And, let's print out the messages:
      print("The post man delivereth: \(fetchedMessages.debugDescription)")
    }
  }

(You can also read an Objective-C Version)

In this sample, we retrieved and printed a list of email headers from an IMAP server. In order to execute the fetch, we request an asynchronous operation object from the MCOIMAPSession instance with our parameters (more on this later). This operation object is able to initiate a connection to Gmail when we call the start method. Now here's where things get a little tricky. We call the start function with a block, which is executed on the main thread when the fetch operation completes. The actual fetching from IMAP is done on a background thread, leaving your UI and other processing free to use the main thread.

Documentation

License

MailCore 2 is BSD-Licensed.

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MailCore 2 provide a simple and asynchronous API to work with e-mail protocols IMAP, POP and SMTP. The API has been redesigned from ground up.

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