We’ve got reports of outgoing emails being rejected by over-zealous mail filters because the Date header is in an unusual position. Since we don’t set any headers, we’re relying on the default ordering on MailMessage. In 21.11 we got Received, Received…, Date, X-Unsent, … In 22.11 we got Date seven headers later: Received, Received…, X-Unsent, From, Subject, Reply To, To, Content-Type, Content-Transfer-Encoding, Date, … Can you confirm that this default order changed? Is there any way to programmatically overcome this? The HeaderCollection offers some Add and Insert methods but I didn’t see how to achieve the original order.
It appears that there has been a change in the default order of email headers in the Aspose.Email library between versions. Users have reported that the order of headers extracted in recent versions differs from earlier versions, which may lead to issues with email filters that are sensitive to header placement.
To address your concern, you can programmatically manage the order of headers using the HeaderCollection class. While the library does not provide a direct method to revert to the original order, you can use the Add and Insert methods to customize the header order as needed.
Here’s a simple example of how you can insert headers at specific positions:
import com.aspose.email.MailMessage;
public class CustomEmailHeaders {
public static void main(String[] args) {
// Create a new instance of MailMessage
MailMessage message = new MailMessage();
// Add headers in the desired order
message.getHeaders().insert("Date", "Wed, 21 Oct 2020 07:28:00 GMT");
message.getHeaders().insert("From", "sender@example.com");
message.getHeaders().insert("To", "recipient@example.com");
message.getHeaders().insert("Subject", "Test Email");
// Save the message
message.save("CustomEmailHeaders.msg");
}
}
In this example, you can see how to insert headers in a specific order. Adjust the header names and values according to your requirements.
If you continue to experience issues or need further assistance, consider checking the latest updates or documentation for any changes related to header management in the Aspose.Email library.
For more details on this topic, you may want to refer to the discussions on header extraction and ordering in the Aspose forums, where similar issues have been addressed.
Sources:
[1]: Order of Extracted Email Headers is Different from that Displayed in Outlook