Unable to send email via gmail api to multiple senders - ios

Question

We're using the new gmail api on iOS to send emails and everything works great for messages with single recipients. When we specify more than one in the "to" field, we get the following error:
Error Domain=com.google.GTLJSONRPCErrorDomain Code=400 "The operation couldn’t be completed. (Invalid to header)
I have verified the content we are sending is in fact a valid rfc822 message.

Answer 1

You should use a list in your to field.
E.g. :
[ "liz6beigle#hotmail.com",
"another.one#email.com" ]
Gmail has a limit of bounces and recipients you can send at the same time.
You cannot store multiple emails under a single string.
Placing a single email address on each line will give better readability and prevent parsing errors.
Here is a code sample in Java from google. I hope it will help others to understand :
/**
* Create a MimeMessage using the parameters provided.
*
* #param to Email address of the receiver.
* #param from Email address of the sender, the mailbox account.
* #param subject Subject of the email.
* #param bodyText Body text of the email.
* #return MimeMessage to be used to send email.
* #throws MessagingException
*/
public static MimeMessage createEmail(String to, String from, String subject,
String bodyText) throws MessagingException {
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
MimeMessage email = new MimeMessage(session);
InternetAddress tAddress = new InternetAddress(to);
InternetAddress fAddress = new InternetAddress(from);
email.setFrom(new InternetAddress(from));
email.addRecipient(javax.mail.Message.RecipientType.TO,
new InternetAddress(to));
email.setSubject(subject);
email.setText(bodyText);
return email;
}
Gmail API : Sending Messages
Check the first code sample.

Answer 2

This was a regression but we finished deploying the fix on Monday, 2014-08-25.

Answer 3

I think you can do the following
get the 'To' fields as this
"test1#example.com, test2#example.com"
then split it with ','
String mail1 = "test1#example.com";
String mail2 = "test2#example.com";
then do this
email.addRecipient(javax.mail.Message.RecipientType.TO,
new InternetAddress(mail1));
email.addRecipient(javax.mail.Message.RecipientType.TO,
new InternetAddress(mail2));
I checked this
it worked

Answer 4

You can use comma separated emails and loop through those emails
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
MimeMessage email = new MimeMessage(session);
Multipart multiPart = new MimeMultipart("alternative");
email.setFrom(new InternetAddress(from));
String to = "xyz#gmail.com,sjaksks#gmail.cm,hysrtt#gmail.com";
String[] split = to.split(",");
for(int i=0;i<split.length;i++) {
email.addRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress(split[i]));
}
email.setSubject(subject);
MimeBodyPart textPart = new MimeBodyPart();
textPart.setText(text, "utf-8");
MimeBodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(html, "text/html; charset=utf-8");
multiPart.addBodyPart(textPart);
multiPart.addBodyPart(htmlPart);
email.setContent(multiPart);
return email;

Answer 5

I had an exchange with the gmail team and they did confirm that this is actually a bug with their api. Not sure when it will be fixed as they didn't provide any more details but it's on their radar.