IMAP .NET component | Mail.dll IMAP client

Enhance your .NET applications in C# and VB.NET with the powerful IMAP .NET client component integrated into cutting-edge Mail.dll email toolkit.

Seamlessly receive and process emails using the IMAP protocol, with support for signature verification and decryption. Our IMAP client is crafted entirely in managed code, ensuring optimal performance.

Compatible with a wide range of frameworks, including .NET framework 2.0-4.8, .NET Core 2.0+, .NET Standard 2.0+, .NET 5.0/.NET 8.0 and newer including ASP.NET Core and Azure. Upgrade your email functionality with ease and efficiency using Mail.dll's IMAP client component.

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IMAP client features

UNIQUE Robust IMAP client plus POP3 and SMTP clients in a single library
Manage folders, search, flag, upload, copy messages
IMAP protocol allows getting most common email data fast
UNIQUE Email component includes most reliable MIME parser on the market
Fully compatible with all IMAP servers:
Microsoft Exchange, Office 365, Gmail, Dovecot, hMailServer and others
IMAP SSL/TLS support
IMAP client TLS 1.2 and TLS 1.3 support
Automatic email attachment encoding/decoding
S/MIME: IMAP received signed emails validation, IMAP received emails decryption
UNIQUE Received DKIM emails validation
UNIQUE iCalendar appointments and vCard support
TNEF support (decodes winmail.dat files)
Proxy support: IMAP over HTTP and Socks proxy (Socks5, Socks4, Socks4a)
IMAP IDLE: push email support for IMAP client
UNIQUE IMAP OAuth 2.0 for web sites (ASP.NET) and IMAP OAuth 2.0 for installed applications support
UNIQUE Supports Gmail extensions for IMAP
Bounce handling for emails received with IMAP
Bayesian spam filter (over 99.5% accuracy)
UNIQUE Build-in HTML e-mail to plain text e-mail converter

Clients about IMAP in Mail.dll

I wanted to drop a short note to you to say hi, just bought a license, and thanks for writing and publishing what is so far the best IMAP tool I’ve found. And I’ve installed 4 or so other components from other vendors.

First let me say: great piece of work. I ordered a license of Mail.dll for fetching Mails via IMAP last week.

I just discovered your product and have installed the trial version. I must say, I am loving how easy it is to work with. Previously I had been using another product and had to do much of the grunt work your product already does for me!

Quick start .NET samples

Receive emails using IMAP in .NET

    using(Imap imap = new Imap())
    {
        imap.ConnectSSL("imap.server.com");
        imap.UseBestLogin("user", "pass");
    
        imap.SelectInbox();

        List<long> uids = imap.Search(
            Flag.Unseen);
        long first = uids[0];
        
        byte[] eml = imap
            .GetMessageByUID(first);
        
        IMail email = new MailBuilder()
            .CreateFromEml(eml);
        
        string subject = email.Subject;
        
        imap.Close();
    }

Receive emails using POP3 in .NET

    using(Pop3 pop3 = new Pop3())
    {
        pop3.ConnectSSL("imap.server.com");
        pop3.UseBestLogin("user", "pass");
    
        List<long> uids = pop3.GetAll();
        long first = uids[0];
        
        byte[] eml = pop3
            .GetMessageByUID(first);
        
        IMail email = new MailBuilder()
            .CreateFromEml(eml);
        
        string subject = email.Subject;
        
        pop3.Close();
    }

C#
VB.NET

Receive emails using IMAP with C# .NET client

	            using(Imap imap = new Imap())
                {
                    imap.ConnectSSL("imap.server.com");  // or Connect for non SSL/TLS
                    imap.UseBestLogin("user", "password");

                    imap.SelectInbox();

                    List<long> uids = imap.Search(Flag.Unseen);
                    foreach (long uid in uids)
                    {
                        IMail email = new MailBuilder()
                            .CreateFromEml(imap.GetMessageByUID(uid));
                        string subject = mail.Subject;
                    }
                    imap.Close();
                }

Receive emails using POP3 with C# .NET client

                using(Pop3 pop3 = new Pop3())
                {
                    pop3.ConnectSSL("pop3.server.com");  // or Connect for non SSL/TLS 
                    pop3.UseBestLogin("user", "password");

                    List<string> uids = pop3.GetAll();
                    foreach (string uid in uids)
                    {
                        IMail email = new MailBuilder()
                            .CreateFromEml(pop3.GetMessageByUID(uid));
                        string subject = email.Subject;
                    }
                    pop3.Close();
                }

Send emails using SMTP with C# .NET client

				
				MailBuilder builder = new MailBuilder();
				builder.From.Add(new MailBox("from@example.com"));
				builder.To.Add(new MailBox("to@example.com"));
				builder.Subject = "Subject";
				builder.Html = @"Html with an image: <img src=""cid:lena"" />";

				var visual = builder.AddVisual(@"c:\lena.jpeg");
				visual.ContentId = "lena";
				var attachment = builder.AddAttachment(@"c:\tmp.doc");
				attachment.SetFileName("document.doc", guessContentType: true);

				IMail email = builder.Create();

                using(Smtp smtp = new Smtp())
                {
                    smtp.Connect("smtp.server.com");  // or ConnectSSL for SSL
                    smtp.UseBestLogin("user", "password");

                    smtp.SendMessage(email);                      
                    smtp.Close();    
                }

Receive emails using POP3 with VB.NET client

                Using imap As New Imap
                    imap.ConnectSSL("imap.server.com")  ' or Connect for non SSL/TLS
                    imap.UseBestLogin("user", "password")

                    imap.SelectInbox()

                    Dim uidList As List(Of Long) = imap.Search(Flag.Unseen)
                    For Each uid As Long In uidList
                        Dim email As IMail = New MailBuilder() _
                            .CreateFromEml(imap.GetMessageByUID(uid))
                        Dim subject As String = email.Subject
                    Next
                    imap.Close()
                End Using

Receive emails using POP3 with VB.NET client

                Using pop3 As New Pop3
                    pop3.ConnectSSL("pop3.server.com")  ' or Connect for non SSL/TLS  
                    pop3.UseBestLogin("user", "password")

                    For Each uid As String In pop3.GetAll()
                        Dim email As IMail = New MailBuilder() _
                            .CreateFromEml(pop3.GetMessageByUID(uid))
                        Dim subject As String = email.Subject
                    Next
                    pop3.Close()
                End Using

Send emails using SMTP with VB.NET client

			    Dim builder As MailBuilder = New MailBuilder()
			    builder.From.Add(New MailBox("from@example.com"))
			    builder.[To].Add(New MailBox("to@example.com"))
			    builder.Subject = "Subject"
			    builder.Html = "Html with an image: <img src=""cid:lena"" />"
			    
				Dim visual = builder.AddVisual("c:\lena.jpeg")
			    visual.ContentId = "lena"
			    Dim attachment = builder.AddAttachment("c:\tmp.doc")
			    attachment.SetFileName("document.doc", guessContentType:=True)

			    Dim email As IMail = builder.Create()

                Using smtp As Smtp = New Smtp
                    smtp.Connect("smtp.server.com")  ' or ConnectSSL for SSL
                    smtp.UseBestLogin("user", "password")

                    smtp.SendMessage(email)
                    smtp.Close()
                End Using

You can find many more .NET IMAP client samples here.