Getting error while connecting to POP3

0 votes

Error is:
Limilabs.Client.ServerException: Please connect first

by
Can you edit your question and include your code please? and StackTrace?
by (301k points)
edited by

1 Answer

0 votes

The simplest code sample for accessing and reading email using POP3 looks like this:

using(Pop3 pop3 = new Pop3())
{
    pop3.ConnectSSL("pop3.server.com");
    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();
}

Remember to use Connect or ConnectSSL method first.

Make sure you are not ignoring any exceptions on those or any other methods.
If server disconnects you for some reason, you'll get an exceptions and you need to connect again.

In case you are using Async methods make sure you await them:

using(Pop3 pop3 = new Pop3())
{
    await pop3.ConnectSSLAsync("pop3.server.com");
    await pop3.UseBestLoginAsync("user", "password");

    // ...

    await pop3.CloseAsync();
}
by (301k points)
Hi,

I am trying to access POP3 synchronously as mentioned by you. I am getting error at very first line

using(Pop3 pop3 = new Pop3())


   Error: Limilabs.Client.ServerException: Please connect first.
   at Limilabs.Client.ClientBase.
   at Limilabs.Client.ClientBase.(Byte[]
   at Limilabs.Client.POP3.Pop3.SendMultiLineCommand(String command, Boolean throwException)
   at Limilabs.Client.POP3.Pop3.()


Any idea why this error is coming while initializing the Pop3 object?
by (101 points)
This is not possible:
Pop3 constructor does not make any remote calls - it must be coming from a different call.

Please double check that you await ConnectAsync call.

How does your code inside the using block look like?
Is the Connect method first method in this block?

What is the version you are using? On what platform (.net/.net core)?

Can you please turn on logging:
https://www.limilabs.com/blog/logging-in-mail-dll
by (301k points)
Following is the code snippet:

            using (Pop3 pop3 = new Pop3())
            {
                pop3.ReceiveTimeout = new TimeSpan(0, 0, 0, 0, 30000);
                pop3.ConnectSSL(SMTPHost, ServerPort);
                pop3.Login(Username, Password);
                // further read logic
             }

SMTPHost, ServerPort, Username and Password :- all are variables and appropriate values are assigned to those.

I am using synchronous connect.
Connect method is first method in the using block.
I am using .NET 4.7.2
Mail.dll version used: 3.0.14185.1633

Error coming at first statement ie using block statement.
Limilabs.Client.ServerException: Please connect first

Let me know if any more information is needed.
by (101 points)
You are using a variable called SMTPHost - are you sure this is a POP3 server address?
What is the server address?

You are using very old version of Mail.dll, does it happen with the latest one?

Please turn on logging:
https://www.limilabs.com/blog/logging-in-mail-dll
by (301k points)
Yes, variable name is SMTPHost but I confirm that it holds correct POP3 server address.

I cannot reveal server address here as it is confidential data.

I have this version of Mail.dll since long time. I never came across error which I mentioned above for any POP3 email server.

I don't have the latest Mail.dll. So I don't know what could be the behavior with latest Mail.dll

Can you tell me in which case following error comes:
Limilabs.Client.ServerException: Please connect first

This might help to understand the root cause of error.
by (101 points)
You can download the latest trial here:
https://www.limilabs.com/mail/download

Please turn on logging:
https://www.limilabs.com/blog/logging-in-mail-dll
by (301k points)
I am not sure if I can try latest trial version immediately or not. The Mail.dll is currently deployed at production environment. I cannot replace it with latest Mail.dll immediately.
Enabling logging is also something which would take sometime.

Meanwhile could you please tell me the scenario when following exception come:
Limilabs.Client.ServerException: Please connect first

This is the exact text which comes in error.

Could this be firewall issue?
by (101 points)
This error means that Pop3 instance is not connected.

Either because Connect method was not invoked -or- there was an exception thrown when Connecting.
by (301k points)
Ok.
1. Connect method was not invoked --> Connect method is invoked in using block, so we can eliminate this possibility.

2. there was exception thrown when connecting ---> the error originates when pop3 constructor is called. I believe exception is thrown before pop3 tries to connect. Any thought?
by (101 points)
This error is not coming from the constructor.
Pop3 constructor is not making any remote calls.

Please use never version and turn on logging.
by (301k points)
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