.NET email component, .NET IMAP component, .NET POP3 component

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IMAP component and POP3 component that allows to receive emails and process emails in .NET applications, in C# and VB.NET. Includes SMTP component for sending emails, along with signing emails and encrypting emails. Supports signature verification and decryption for received emails. Written entirely in managed code. Works with .NET 2.0-4.7.2, .NET 4.8, Mono, .NET Core 2.0+, .NET Standard 2.0+, .NET 5.0, .NET 6.0 and .NET 7.0.

Features

IMAP client for receiving emails, POP3 client for receiving emails, SMTP client for sending emails in a single package
UNIQUE Email component includes most reliable MIME parser on the market
UNIQUE Covered with 5,500+ unit and integration tests
Fully compatible with Microsoft Exchange (all versions), Office 365, Gmail, Dovecot, hMailServer and others
IMAP SSL/TLS, SMTP SSL/TLS, POP3 SSL/TLS are all supported
TLS 1.2 support
Automatic email attachment encoding/decoding
S/MIME: sending signed emails, sending encrypted emails
S/MIME: received signed emails validation, received emails decryption
UNIQUE Received emails DKIM validation and signing
UNIQUE iCalendar appointments and vCard support
Easy Outlook .msg files processing and .msg to MIME converter
TNEF support (decodes winmail.dat files)
Create attachments from a file or byte array
Secure login (APOP, CRAM-MD5, DIGEST-MD5 support)
Proxy support: HTTP and Socks proxy (Socks5, Socks4, Socks4a)
IMAP IDLE: push email support for IMAP client
UNIQUE Template engine support
Support for displaying emails in Windows applications
UNIQUE OAuth 2.0 for web sites (ASP.NET) and OAuth 2.0 for installed applications support
UNIQUE IMAP protocol Gmail extensions
Bounce handlingfor emails received with IMAP and POP3
Bayesian spam filter (over 99.5% accuracy)
UNIQUE Build-in HTML email to plain text email converter

What folks are saying about Mail.dll

Just bought a license. Mail.dll is an absolutely fantastic email library. I would recommend it to anyone who needs to send or receive emails from .NET applications

I like your product. I should also recognize the excellent technical support you provide; my questions were always promptly answered, and the answers were very helpful every time.

I’ve installed 4 or so other email components from other vendors, played with each of them to see how easy they are to work with, and yours was up and running quicker, easier, and better than all the others.

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();
    }

You can find more samples here.

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