BestPractice to show attachment info for N Messages

Aspose.Email Product Family
1

Hello,

currently we implement a IMAP Mail client using Aspose.
We want to show the attachment info (name, size, …) of every e-Mail.
For example 150 Mails takes 20 seconds to get the messages with attachment info.
Without getting the attachment info it takes 1-2 seconds.
The FetchMessage method takes 7 seconds (!!!) for a Mail with 3 small attachments!

We implement your mentoined solution: How to read or download the attachments from mail box using aspose IMAP api - #2 by kashif.iqbal

Is there a better (FASTER) way to get mails with attaechment information??

Kind regards,
Andy

2

@AStelzner

ImapQueryBuilder class represents the builder of search expression that used by IMAP protocol. We suggest you please use ImapQueryBuilder.CustomSearch method to achieve your requirement. Hope this helps you.

3

Sorry, but this does not help :blush:

I try the following and filter messages by size >0 (nearly all), but i cannot find any attachment information!

var connection = _imapClient.CreateConnection();

ImapQueryBuilder builder = new ImapQueryBuilder();

builder.MessageSize.Greater(0);

MailQuery query = builder.GetQuery();

ImapMessageInfoCollection messageColl = _imapClient.ListMessages(query);

foreach (var message in messageColl)

{

// no attachment info in message object!!!

}

Please provide an example how to get attachment infos (size, name, type, …) using your proposal.

Kind regards,

Andy

dfX3_fdc7b91e-6c57-4128-92c2-5b9fbad02274.png (1.42 KB)

QR8c341bc8-75b7-4e2c-99c3-2d2ba4031ede.png (458 Bytes)

4

@AStelzner

We are working over your query and will get back to you soon.

5

@AStelzner

Following code snippet shows how to search messages with attachments. Please use ImapQueryBuilder.CustomSearch method as shown below. Hope this helps you.

using (ImapClient client = new ImapClient("ImapUrl", 143, "EMail", "Password"))
{
    int cnt = 10;
    for (int i = 0; i < cnt; i++)
    {
        MailMessage message = new MailMessage(
            user.EMail,
            user.EMail,
            $"EMAILNET-40333 - {g} - {i}",
            "EMAILNET-40333 Filter messages containing attachments through ImapClient");
        int j = i % 2;
        if (j == 0)
            message.Attachments.Add(new Attachment(new MemoryStream(new byte[1024]), $"attachment - {i}"));
        client.AppendMessage(message);
    }
    ImapMessageInfoCollection messageInfoCol = null;
    switch (serverType)
    {
        case "Gmail":
            {
                ImapQueryBuilder builder = new ImapQueryBuilder();
                builder.CustomSearch("X-GM-RAW \"has:attachment\"");
                MailQuery query = builder.GetQuery();
                messageInfoCol = client.ListMessages(query);
            }
            break;
        default: // Normal servers
            {
                ImapQueryBuilder builder = new ImapQueryBuilder();
                builder.HasHeader("Content-Type", "multipart/mixed");
                MailQuery query = builder.GetQuery();
                messageInfoCol = client.ListMessages(query);
            }
            break;
    }
                 
    foreach (var mi in messageInfoCol)
    {
        MailMessage mm = client.FetchMessage(mi.SequenceNumber);
                    
    }
}
6

First of all, thank you for the example.

Unfortunately, that doesn’t solve our problem.

We want to display a list (ALL, not filtered) of emails and their attachment information (name and size). But if an email with large attachments is underneath it takes a very long time, only to SHOW the information. With a mailbox with over 1000 messages and some emails with attachments, it takes so long that you can get a coffee.

Test this code with a Email with 3 Attachments with minimum of 5 MB and meassure the time.

Kind Regards,
Andy

7

@AStelzner

We have logged an investigation ticket in our issue tracking system as EMAILNET-40525. We will inform you via this forum thread once there is an update available on it.

We apologize for your inconvenience.

8

@AStelzner

A feature has been added to get information about attachments such as name, size without fetching the attachment data.

Changes in public API

Aspose.Email.Clients.Imap.ImapAttachmentInfo - Represents an attachment information.
Aspose.Email.Clients.Imap.ImapAttachmentInfoCollection - Represents a collection of ImapAttachmentInfo.
Aspose.Email.Clients.Imap.ListAttachments(int sequenceNumber) - Gets an information for each attachment in message.

Code sample

var messageInfoCollection = imapClient.ListMessages();

foreach (var message in messageInfoCollection)
{
    var attachmentInfoCollection = imapClient.ListAttachments(message.SequenceNumber);

    foreach (var attachmentInfo in attachmentInfoCollection)
    {
        Console.WriteLine("Attachment: {0} (size: {1})", attachmentInfo.Name, attachmentInfo.Size);
    }
}