<?php
$mail = new Zend_Mail_Storage_Pop3(array('host'     => 'localhost',
                                         'user'     => 'test',
                                         'password' => 'test'));

echo $mail->countMessages() . " messages found\n";
foreach ($mail as $message) {
    echo "Mail from '{$message->from}': {$message->subject}\n";
}

Mbox and Maildir are the two supported formats for local mail storages, both in their most simple formats.

If you want to read from a Mbox file you only need to give the filename to the constructor of Zend_Mail_Storage_Mbox:

<?php
$mail = new Zend_Mail_Storage_Mbox(array('filename' => '/home/test/mail/inbox'));

Maildir is very similar but needs a dirname:

<?php
$mail = new Zend_Mail_Storage_Maildir(array('dirname' => '/home/test/mail/'));

Both constructors throw a Zend_Mail_Exception if the storage can't be read.

For remote storages the two most popular protocols are supported: Pop3 and Imap. Both need at least a host and a user to connect and login. The default password is an empty string, the default port as given in the protocol RFC.

<?php
// connecting with Pop3
$mail = new Zend_Mail_Storage_Pop3(array('host'     => 'example.com'
                                         'user'     => 'test',
                                         'password' => 'test'));

// connecting with Imap
$mail = new Zend_Mail_Storage_Imap(array('host'     => 'example.com'
                                         'user'     => 'test',
                                         'password' => 'test'));

// example for a none standard port
$mail = new Zend_Mail_Storage_Pop3(array('host'     => 'example.com',
                                         'port'     => 1120
                                         'user'     => 'test',
                                         'password' => 'test'));

For both storages SSL and TLS are supported. If you use SSL the default port changes as given in the RFC.

<?php
// examples for Zend_Mail_Storage_Pop3, same works for Zend_Mail_Storage_Imap

// use SSL on different port (default is 995 for Pop3 and 993 for Imap)
$mail = new Zend_Mail_Storage_Pop3(array('host'     => 'example.com'
                                         'user'     => 'test',
                                         'password' => 'test',
                                         'ssl'      => 'SSL'));

// use TLS
$mail = new Zend_Mail_Storage_Pop3(array('host'     => 'example.com'
                                         'user'     => 'test',
                                         'password' => 'test',
                                         'ssl'      => 'TLS'));

Both constructors can throw Zend_Mail_Exception or Zend_Mail_Protocol_Exception (extends Zend_Mail_Exception), depending on the type of error.

Once you've opened the storage messages can be fetched. You need the message number, which is a counter starting with 1 for the first message. To fetch the message you use the method getMessage():

<?php
$message = $mail->getMessage($messageNum);

Array access is also supported, but won't supported any additional parameters that could be added to getMessage(). As long as you don't mind and can live with defaults you may use:

<?php
$message = $mail[$messageNum];

For iterating over all messages the Iterator interface is implemented:

<?php
foreach ($mail as $messageNum => $message) {
    // do stuff ...
}

To count the messages in the storage you can either use the method countMessages() or use array access:

<?php
// method
$maxMessage = $mail->countMessages();

// array access
$maxMessage = count($mail);

To remove a mail you use the method removeMessage() or again array access:

<?php
// method
$mail->removeMessage($messageNum);

// array access
unset($mail[$messageNum]);

After you fetched the messages with getMessage() you want to fetch headers, the content or single parts of a multipart message. All headers can be accessed via properties or the method getHeader() if you want more control or have unusual header names. The header names are lower-cased internally, thus the case of the header name in the mail message doesn't matter. Also headers with a dash can be written in camel-case.

<?php
// get the message object
$message = $mail->getMessage(1);

// output subject of message
echo $message->subject . "\n";

// get content-type header
$type = $message->contentType;

If you have multiple headers with the same name i.e. the Received headers you might want it as array instead of a string, which is possible with the getHeader() method.

<?php
// get header as property - the result is always a string, with new lines between the single occurrences in the message
$received = $message->received;

// the same via getHeader() method
$received = $message->getHeader('received', 'string');

// better an array with a single entry for every occurrences
$received = $message->getHeader('received', 'array');
foreach ($received as $line) {
    // do stuff
}

// if you don't define a format you'll get the internal representation (string for single headers, array for multiple)
$received = $message->getHeader('received');
if (is_string($received)) {
    // only one received header found in message
}

The method getHeaders() returns all headers as array with the lower-cased name as key and the value as array for multiple headers or as string for single headers.

<?php
// dump all headers
foreach ($message->getHeaders as $name => $value) {
    if (is_string($value)) {
        echo "$name: $value\n";
        continue;
    }
    foreach ($value as $entry) {
        echo "$name: $entry\n";
    }
}

If you don't have a multipart message fetching the content is easy done via getContent(). Unlike the headers the content is only fetched when needed (aka late-fetch).

<?php
// output message content for HTML
echo '<pre>';
echo $message->getContent();
echo '</pre>';

Checking for a multipart message is done with the method isMultipart(). If you have multipart message you can get an instance of Zend_Mail_Part with the method getPart(). Zend_Mail_Part is the base class of Zend_Mail_Message, so you have the same methods: getHeader(), getHeaders(), getContent(), getPart(), isMultipart and the properties for headers.

<?php
// get the first none multipart part
$part = $message;
while ($part->isMultipart()) {
    $part = $message->getPart(1);
}
echo 'Type of this part is ' . strtok($part->contentType, ';') . "\n";
echo "Content:\n";
echo $part->getContent();

Zend_Mail_Part also implements RecursiveIterator, which makes it easy to scan through all parts. And for easy output it also implements the magic method __toString(), which returns the content.

<?php
// output first text/plain part
$foundPart = null;
foreach (RecursiveIteratorIterator($mail->getMessage(1)) as $part) {
    try {
        if (strtok($part->contentType, ';') == 'text/plain') {
            $foundPart = $part;
            break;
        }
    } catch (Zend_Mail_Exception $e) {
        // ignore
    }
}
if (!$foundPart) {
    echo 'no plain text part found';
} else {
    echo "plain text part: \n" . $foundPart;
}

Maildir and IMAP support storing flags. The class Zend_Mail_Storage has constants for all known maildir and IMAP system flags, named Zend_Mail_Storage::FLAG_<flagname>. To check for flags Zend_Mail_Message has a method called hasFlag(). With getFlags() you'll get all set flags.

<?php
// find unread messages
echo "Unread mails:\n";
foreach ($mail as $message) {
    if ($message->hasFlag(Zend_Mail_Storage::FLAG_SEEN)) {
        continue;
    }
    // mark recent/new mails
    if ($message->hasFlag(Zend_Mail_Storage::FLAG_RECENT)) {
        echo '! ';
    } else {
        echo '  ';
    }
    echo $message->subject . "\n";
}


// check for known flags
$flags = $message->getFlags();
echo "Message is flagged as: ";
foreach ($flags as $flag) {
    switch ($flag) {
        case Zend_Mail_Storage::FLAG_ANSWERED:
            echo 'Answered ';
            break;
        case Zend_Mail_Storage::FLAG_FLAGGED:
            echo 'Flagged ';
            break;

        // ...
        // check for other flags
        // ...

        default:
            echo $flag . '(unknown flag) ';
    }
}

As IMAP allows user or client defined flags you could get flags, that don't have a constant in Zend_Mail_Storage. Instead they are returned as string and can be checked the same way with hasFlag().

<?php
// check message for client defined flags $IsSpam, $SpamTested
if (!$message->hasFlag('$SpamTested')) {
    echo 'message has not been tested for spam';
} else if ($message->hasFlag('$IsSpam')) {
    echo 'this message is spam';
} else {
    echo 'this message is ham';
}

All storages, except Pop3, support folders, also called mailboxes. The interface implemented by all storages supporting folders is called Zend_Mail_Storage_Folder_Interface. Also all of these classes have an additional optional parameter called folder, which is the folder selected after login, in the constructor.

For the local storages you need to use separate classes called Zend_Mail_Storage_Folder_Mbox or Zend_Mail_Storage_Folder_Maildir. Both need one parameter called dirname with the name of the base dir. The format for maildir is as defined in maildir++ (with a dot as default delimiter), Mbox is a directory hierarchy with Mbox files. If you don't have a Mbox file called INBOX in your Mbox base dir you need to set an other folder in the constructor.

Zend_Mail_Storage_Imap already supports folders by default. Examples for opening these storages:

<?php
// mbox with folders
$mail = new Zend_Mail_Storage_Folder_Mbox(array('dirname' => '/home/test/mail/'));

// mbox with a default folder not called INBOX, also works
// with Zend_Mail_Storage_Folder_Maildir and Zend_Mail_Storage_Imap
$mail = new Zend_Mail_Storage_Folder_Mbox(array('dirname' => '/home/test/mail/',
                                                'folder'  => 'Archive'));

// maildir with folders
$mail = new Zend_Mail_Storage_Folder_Maildir(array('dirname' => '/home/test/mail/'));

// maildir with colon as delimiter, as suggested in Maildir++
$mail = new Zend_Mail_Storage_Folder_Maildir(array('dirname' => '/home/test/mail/'
                                                   'delim'   => ':'));

// imap is the same with and without folders
$mail = new Zend_Mail_Storage_Imap(array('host'     => 'example.com'
                                         'user'     => 'test',
                                         'password' => 'test'));

With the method getFolders($root = null) you can get the folder hierarchy starting with the root folder or the given folder. It's returned as instance of Zend_Mail_Storage_Folder, which implements RecursiveIterator and all children are also instances of Zend_Mail_Storage_Folder. Each of these instances has a local and a global name returned by the methods getLocalName() and getGlobalName(). The global name is the absolute name from the root folder (including delimiters), the local name is the name in the parent folder.

If you use the iterator the key of the current element is the local name. The global name is also returned by the magic method __toString(). Some folders may not be selectable, which means they can't store messages and selecting them results in an error. This can be checked with the method isSelectable(). So it's very easy to output the whole tree in a view:

<?php
$folders = new RecursiveIteratorIterator($this->mail->getFolders(),
                                         RecursiveIteratorIterator::SELF_FIRST);
echo '<select name="folder">';
foreach ($folders as $localName => $folder) {
    $localName = str_pad('', $folders->getDepth(), '-', STR_PAD_LEFT) . $localName;
    echo '<option';
    if (!$folder->isSelectable()) {
        echo ' disabled="disabled"';
    }
    echo ' value="' . htmlspecialchars($folder) . '">'
        . htmlspecialchars($localName) . '</option>';
}
echo '</select>';

The current selected folders is returned by the method getSelectedFolder(). Changing the folder is done with the method selectFolder(), which needs the global name as parameter. If you want to avoid to write delimiters you can also use the properties of a Zend_Mail_Storage_Folder instance:

<?php
// depending on your mail storage and its settings $rootFolder->Archive->2005
// is the same as:
//   /Archive/2005
//  Archive:2005
//  INBOX.Archive.2005
//  ...
$folder = $mail->getFolders()->Archive->2005;
echo 'Last folder was ' . $mail->getSelectedFolder() . "new folder is $folder\n";
$mail->selectFolder($folder);