iCloud supports access via IMAP and SMTP protocols, POP3 is not supported. Below you can find the configuration settings for those protocols.

Both (IMAP and SMTP) use implicit SSL (use ConnectSSL method) and explicit SSL (you can use Connect method and then secure the channel using StartTLS method)

IMAP

Server: imap.mail.me.com
SSL: true-implicit
Port: 993 (default)
User: pat (not pat@icloud.com)

SMTP

Server: smtp.mail.me.com
SSL: true-explicit
Port: 587 (default)
User: pat@icloud.com (not pat)

Following are the code samples for Mail.dll .NET IMAP, POP3 and SMTP component.

// C#

using (Imap client = new Imap())
{
    client.ConnectSSL("imap.mail.me.com");
    client.UseBestLogin("pat", "password");
    ...
}

using (Smtp client = new Smtp ())
{
    client.Connect("smtp.mail.me.com");
    client.StartTLS();
    client.UseBestLogin("pat@icloud.com", "password");
    ...
}

' VB.NET

Using client As New Imap()
	client.ConnectSSL("imap.mail.me.com")
	client.UseBestLogin("pat", "password")
	...
End Using

Using client As New Smtp()
	client.Connect("smtp.mail.me.com")
	client.StartTLS()
	client.UseBestLogin("pat@icloud.com", "password")
	...
End Using

AOL supports access via IMAP, POP3 and SMTP protocols. Below you can find the configuration settings for all protocols.

All AOL servers (IMAP, POP3 and SMTP) can work in plain mode (you can use Connect method) or use implicit SSL (use ConnectSSL method) or use explicit SSL (you can use Connect method and then secure the channel using StartTLS or STLS methods)

IMAP

Server: imap.aol.com
SSL: false / true-implicit / true-explicit
Port: 143 (default) / 993 (default) / 143 (default)
User: pat@yahoo.com

POP3

Server: pop.aol.com
SSL: false / true-implicit / true-explicit
Port: 110 (default) / 995 (default) / 110 (default)
User: pat@aol.com

SMTP

Server: smtp.aol.com
SSL: false / true-implicit / true-explicit
Port: 587 (default) / 465 (default) / 587 (default)
User: pat@aol.com

Following are the code samples for Mail.dll .NET IMAP, POP3 and SMTP component.

// C#

using (Imap client = new Imap())
{
    client.ConnectSSL("imap.aol.com");
    client.UseBestLogin("pat@aol.com", "password");
    ...
}

using (Pop3 client = new Pop3())
{
    client.ConnectSSL("pop3.aol.com");
    client.UseBestLogin("pat@aol.com", "password");
    ...
}

using (Smtp client = new Smtp ())
{
    client.ConnectSSL("smtp.aol.com");
    client.UseBestLogin("pat@aol.com", "password");
    ...
}

' VB.NET

Using client As New Imap()
	client.ConnectSSL("imap.aol.com")
	client.UseBestLogin("pat@aol.com", "password")
	...
End Using

Using client As New Pop3()
	client.ConnectSSL("pop3.aol.com")		
	client.UseBestLogin("pat@aol.com", "password")
	...
End Using

Using client As New Smtp()
	client.ConnectSSL("smtp.aol.com")
	client.UseBestLogin("pat@aol.com", "password")
	...
End Using

You can find more details about using implicit and explicit SSL or TLS with email protocols:

• Using SSL with IMAP
• Using SSL with POP3
• Using SSL with SMTP

Hotmail supports access via IMAP, POP3 and SMTP protocols. Below you can find the configuration settings for those protocols.

All Hotmail servers (POP3 and SMTP) use implicit SSL (use ConnectSSL method).
SMTP server supports explicit SSL (you can use Connect method and then secure the channel using StartTLS method)

IMAP

Server: imap-mail.outlook.com
SSL: true-implicit
Port: 993 (default)
User: pat@hotmail.com

POP3

Server: pop-mail.outlook.com
SSL: true-implicit
Port: 995 (default)
User: pat@hotmail.com

POP access must be turned on via web interface.
In the web interface click “gear icon” in the top, right corner, then select “Options”.

Depending on the UI version:

On the options pane click “Mail/Accounts/POP and IMAP”. In the “POP options” section select “Yes”.

-or-

On the options pane click “Connect devices and apps with POP” link. In the “POP” section mark “Enable”.

SMTP

Server: smtp-mail.outlook.com
SSL: true-explicit
Port: 587 (default)
User: pat@hotmail.com

Following are the code samples for Mail.dll .NET IMAP, POP3 and SMTP component.

// C#

using (Imap client = new Imap())
{
    client.ConnectSSL("imap-mail.outlook.com");
    client.UseBestLogin("pat@hotmail.com", "password");
    ...
}

using (Pop3 client = new Pop3())
{
    client.ConnectSSL("pop-mail.outlook.com");
    client.UseBestLogin("pat@hotmail.com", "password");
    ...
}

using (Smtp client = new Smtp ())
{
    client.Connect("smtp-mail.outlook.com");
    client.StartTLS();
    client.UseBestLogin("pat@hotmail.com", "password");
    ...
}

' VB.NET

Using client As New Imap()
	client.ConnectSSL("imap-mail.outlook.com")
	client.UseBestLogin("pat@hotmail.com", "password")
	...
End Using

Using client As New Pop3()
	client.ConnectSSL("pop-mail.outlook.com")		
	client.UseBestLogin("pat@hotmail.com", "password")
	...
End Using

Using client As New Smtp()
	client.Connect("smtp-mail.outlook.com")
	client.StartTLS()
	client.UseBestLogin("pat@hotmail.com", "password")
	...
End Using

Outlook.com supports access via POP3 and SMTP protocols. Below you can find the configuration settings for those protocols.

All Outlook.com servers (POP3 and SMTP) use implicit SSL (use ConnectSSL method).
SMTP server also supports explicit SSL (you can use Connect method and then secure the channel using StartTLS method)

IMAP

Server: imap-mail.outlook.com
SSL: true-implicit
Port: 993 (default)
User: pat@outlook.com

POP3

Server: pop-mail.outlook.com
SSL: true-implicit
Port: 995 (default)
User: pat@outlook.com

POP access must be turned on via web interface.
In the web interface click “gear icon” in the top, right corner, then select “Options”.

Depending on the UI version:

On the options pane click “Mail/Accounts/POP and IMAP”. In the “POP options” section select “Yes”.

-or-

On the options pane click “Connect devices and apps with POP” link. In the “POP” section mark “Enable”.

SMTP

Server: smtp-mail.outlook.com
SSL: true-explicit
Port: 587 (default)
User: pat@outlook.com

Following are the code samples for Mail.dll .NET IMAP, POP3 and SMTP component.

// C#

using (Imap client = new Imap())
{
    client.ConnectSSL("imap-mail.outlook.com");
    client.UseBestLogin("pat@outlook.com", "password");
    ...
}

using (Pop3 client = new Pop3())
{
    client.ConnectSSL("pop-mail.outlook.com");
    client.UseBestLogin("pat@outlook.com", "password");
    ...
}

using (Smtp client = new Smtp ())
{
    client.Connect("smtp-mail.outlook.com");
    client.StartTLS();
    client.UseBestLogin("pat@outlook.com", "password");
    ...
}

' VB.NET

Using client As New Imap()
	client.ConnectSSL("imap-mail.outlook.com")
	client.UseBestLogin("pat@outlook.com", "password")
	...
End Using

Using client As New Pop3()
	client.ConnectSSL("pop3-mail.outlook.com")		
	client.UseBestLogin("pat@outlook.com", "password")
	...
End Using

Using client As New Smtp()
	client.ConnectSSL("smtp-mail.outlook.com")
	client.StartTLS();
	client.UseBestLogin("pat@outlook.com", "password")
	...
End Using

Yahoo supports access via IMAP, POP3 and SMTP protocols. Below you can find the configuration settings for all protocols.

All Yahoo servers (IMAP, POP3 and SMTP) don’t use SSL (you can use Connect method) or use implicit SSL (use ConnectSSL method). IMAP and POP3 servers additionally support explicit SSL (you can use Connect method and then secure the channel using StartTLS or STLS methods)

IMAP

Server: imap.mail.yahoo.com
SSL: true-implicit
Port: 993 (default)
User: pat@yahoo.com

POP3

Server: pop.mail.yahoo.com
SSL: true-implicit
Port: 995 (default)
User: pat@yahoo.com

SMTP

Server: smtp.mail.yahoo.com
SSL: false / true-implicit
Port: 587 (default) / 465 (default)
User: pat@yahoo.com

Following are the code samples for Mail.dll .NET IMAP, POP3 and SMTP component.

// C#

using (Imap client = new Imap())
{
    client.ConnectSSL("imap.mail.yahoo.com");
    client.UseBestLogin("pat@yahoo.com", "password");
    ...
}

using (Pop3 client = new Pop3())
{
    client.ConnectSSL("pop.mail.yahoo.com");
    client.UseBestLogin("pat@yahoo.com", "password");
    ...
}

using (Smtp client = new Smtp ())
{
    client.ConnectSSL("smtp.mail.yahoo.com");
    client.UseBestLogin("pat@yahoo.com", "password");
    ...
}

' VB.NET

Using client As New Imap()
	client.ConnectSSL("imap.mail.yahoo.com")
	client.UseBestLogin("pat@yahoo.com", "password")
	...
End Using

Using client As New Pop3()
	client.ConnectSSL("pop.mail.yahoo.com")		
	client.UseBestLogin("pat@yahoo.com", "password")
	...
End Using

Using client As New Smtp()
	client.ConnectSSL("smtp.mail.yahoo.com")
	client.UseBestLogin("pat@yahoo.com", "password")
	...
End Using

You can find more details about using implicit and explicit SSL or TLS with email protocols:

• Using SSL with IMAP
• Using SSL with POP3
• Using SSL with SMTP