Google Email API is raising 400 error. Recipient address required (c#)

Question

I have seen this similar question but I am still not sure how to proceed.

Recently I upgraded my Gmail API library so I don't know if it is related.

I am getting a similar error:

<LogEntry Date="2021-08-22 12:35:10" Severity="Exception" Source="MSAToolsGMailLibrary.MSAToolsGMailLibraryClass.SendEmail" ThreadId="1"> <Exception Type="Google.GoogleApiException" Source="Google.Apis.Requests.ClientServiceRequest`1+&lt;ParseResponse&gt;d__35.MoveNext"> <Message>Google.Apis.Requests.RequestError Recipient address required [400] Errors [ Message[Recipient address required] Location[ - ] Reason[invalidArgument] Domain[global] ] </Message> <StackTrace> at Google.Apis.Requests.ClientServiceRequest`1.&lt;ParseResponse&gt;d__35.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Google.Apis.Requests.ClientServiceRequest`1.Execute() at MSAToolsGMailLibrary.MSAToolsGMailLibraryClass.SendEmail(String From, String Subject, String Attachment)</StackTrace> </Exception> </LogEntry>

This happenes even if I try my test code:

 using Message = Google.Apis.Gmail.v1.Data.Message public bool SendTestEmail(string From, string Subject, string Body) { try { MailMessage mail = new MailMessage(); mail.Subject = Subject; mail.Body = Body; mail.From = new MailAddress(From); mail.IsBodyHtml = false; mail.To.Add(new MailAddress(From)); MimeKit.MimeMessage mimeMessage = MimeKit.MimeMessage.CreateFromMailMessage(mail); Message message = new Message(); message.Raw = Base64UrlEncode(mimeMessage.ToString()); var result = m_Service.Users.Messages.Send(message, "me").Execute(); } catch (Exception ex) { SimpleLog.Log(ex); return false; } return true; } private string Base64UrlEncode(string input) { var inputBytes = System.Text.Encoding.UTF8.GetBytes(input); return Convert.ToBase64String(inputBytes) .Replace('+', '-') .Replace('/', '_') .Replace("=", ""); }

I confirm that I am connected to my account with the right credentials. Never had this problem before.

Andrew Truckle · Accepted Answer · 2021-08-23 15:56:49Z

This is the correct way to send the email:

public bool SendTestEmail(string From, string Subject, string Body) { try { var mimeMessage = new MimeMessage(); mimeMessage.From.Add(MailboxAddress.Parse(From)); mimeMessage.ReplyTo.Add(MailboxAddress.Parse(From)); mimeMessage.To.Add(MailboxAddress.Parse(From)); mimeMessage.Subject = Subject; mimeMessage.Body = new TextPart("plain") { Text = Body }; Message message = new Message(); using (var memory = new MemoryStream()) { mimeMessage.WriteTo(memory); var buffer = memory.GetBuffer(); int length = (int)memory.Length; message.Raw = Convert.ToBase64String(buffer, 0, length); } var result = m_Service.Users.Messages.Send(message, "me").Execute(); } catch (Exception ex) { SimpleLog.Log(ex); return false; } return true; }

The code was kindly suggested to me by the MimeKit author on their GitHub site and they provided an explanation:

The problem with MimeMessage.ToString() is that it's often impossible to represent a MIME message entirely in 1 text encoding and so MimeKit has no choice but to use ISO-8859-1 in order to be consistent.

Internally, what ToString() does is message.WriteTo (memoryStream) and then convert the memory stream buffer into a string using the ISO-8859-1 text encoding.

If you have any non-ASCII (and non-ISO-8859-1) characters in your message, it may break things.

MimeKit, up until 2.14 or so, used to add a warning header "X-MimeKit-Warning: Do NOT use ToString()! Use WriteTo() instead!" to the top of every message if you used ToString().

Adam Cox · Accepted Answer · 2023-02-07 18:28:33Z

Here is what I ended up crafting for sending email:

public static Message? SendEmail( GmailService service, string subject, string body, string recipientAddress, string recipientName, GmailOptions emailOptions ) { Message? responseMessage; string senderAddress = emailOptions.AccountEmail; string senderName = emailOptions.AccountDisplayName; string raw; using (var mimeMessage = new MimeMessage { Body = new TextPart("html") { Text = body }, Subject = subject }) { mimeMessage.To.Add(new MailboxAddress(recipientName, recipientAddress)); mimeMessage.From.Add(new MailboxAddress(senderName, senderAddress)); using (var stream = new MemoryStream()) { mimeMessage.WriteTo(stream); stream.Position = 0; using (var reader = new StreamReader(stream)) { string rawString = reader.ReadToEnd(); byte[] rawBytes = Encoding.UTF8.GetBytes(rawString); raw = Convert.ToBase64String(rawBytes); } } } var messageBody = new Message() { Raw = raw }; var sendRequest = service.Users.Messages.Send(messageBody, userId: senderAddress); responseMessage = sendRequest.Execute(); return responseMessage; }

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