Need clarification on implementing custom SMTP response codes in IMailboxFilter

[c3328148]

I'm trying to implement custom SMTP response codes in my mailbox filters but finding some inconsistencies in the documentation and implementation.

In the sample code from the README:

public class SampleMailboxFilter : IMailboxFilter, IMailboxFilterFactory
{
    public Task<MailboxFilterResult> CanAcceptFromAsync(ISessionContext context, IMailbox @from, int size, CancellationToken cancellationToken)
    {
        if (String.Equals(@from.Host, "test.com"))
        {
            return Task.FromResult(MailboxFilterResult.Yes);
        }
        return Task.FromResult(MailboxFilterResult.NoPermanently);
    }
    // ...
}

However, when implementing this in SmtpServer 10.0.0.1:

MailboxFilterResult appears to be deprecated/removed
The base MailboxFilter class uses bool return types instead
It's unclear what the current best practice is for returning custom SMTP response codes

Currently, I'm setting the response through context.Response = SmtpResponse.Create(code, message), but I'm unsure if this is the recommended approach.
Could you please clarify:

What is the current recommended way to implement custom SMTP responses in mailbox filters?
Is there a preferred method between using context.Properties["SmtpResponse"] vs context.Response?
Could you provide an updated example showing the correct implementation for version 10.0.0.1?

Thanks for your help!

[cosullivan]

Hi,

If you want to return custom SMTP responses now, you can just throw an SmtpResponseException.

throw new SmtpResponseException(new SmtpResponse(SmtpReplyCode.MailboxUnavailable, "this is a custom error"));

The SmtpResponseException is handled internally.