POP3 .NET component | Mail.dll POP3 client

Elevate the capabilities of your .NET applications in C# and VB.NET with the robust POP3 .NET client component seamlessly integrated into cutting-edge Mail.dll email toolkit.

Effortlessly receive and manage emails using the POP3 protocol, featuring advanced functionalities such as signature verification and decryption. Our POP3 client is meticulously crafted in managed code, guaranteeing superior performance.

Designed to seamlessly integrate with various 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. Streamline and enhance your email capabilities effortlessly with Mail.dll's POP3 client component for an optimal user experience.

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POP3 client features

UNIQUE Complete POP3 client plus IMAP and SMTP clients in a single library
UNIQUE Email component includes most reliable MIME parser on the market
Fully compatible with all POP3 servers:
Microsoft Exchange, Office 365, Gmail, Dovecot, hMailServer and others
POP3 SSL/TLS support
POP3 client TLS 1.2 and TLS 1.3 support
Automatic email attachment encoding/decoding
S/MIME: POP3 received signed emails validation, POP3 received emails decryption
UNIQUE Received DKIM emails validation
UNIQUE iCalendar appointments and vCard support
TNEF support (decodes winmail.dat files)
Proxy support: POP3 over HTTP and Socks proxy (Socks5, Socks4, Socks4a)
Secure login (APOP, CRAM-MD5, DIGEST-MD5 support)
Bounce handling for emails received with POP3
Bayesian spam filter (over 99.5% accuracy)
UNIQUE Build-in HTML e-mail to plain text e-mails converter

Clients about POP3 in Mail.dll

Just bought a license. Mail.dll is an absolutely fantastic POP3 library. I would recommend it to anyone who needs to send or receive emails from .NET applications

Well, after discovering your Mail.dll it only took a few hours to implement full POP3 support. I will not use anything but your dll.

Thank-you very much my developers just tested that code sample and it works well.
P.S. Awesome component we love it!

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 POP3 client samples here.