What is exactly hostname for sending Microsoft Exchange email with mailcore - mailcore2

Question

I can not send MS Exchange email with mailcore.
It always returns an error "A stable connection to the server could not be established".
Here is my code
smtpSession.hostname = #"smtp.outlook.office365.co.uk";
smtpSession.username = [currentUser objectForKey:#"email_account"];
smtpSession.password = [currentUser objectForKey:#"email_password"];
smtpSession.port = 25;
smtpSession.connectionType = MCOConnectionTypeClear;
I think it because of the hostname.
Could anybody tell me what is exactly hostname of MS Exchange in this case?

Answer 1

Finally, I found out answer here
smtpSession.hostname = #"smtp.office365.com";
smtpSession.username = [currentUser objectForKey:#"email_account"];
smtpSession.password = [currentUser objectForKey:#"email_password"];
smtpSession.port = 25;
smtpSession.connectionType = MCOConnectionTypeStartTLS;

Answer 2

For future reference for others here's a complete example using MailCore2 added using CocoaPods
#import <MailCore/MailCore.h>
MCOSMTPSession *smtpSession = [[MCOSMTPSession alloc] init];
smtpSession.hostname = #"smtp.outlook.office365.com";
smtpSession.username = #"user#domain.com";
smtpSession.password = #"NotMyPass";
smtpSession.port = 587;
smtpSession.connectionType = MCOConnectionTypeStartTLS;
MCOMessageBuilder * builder = [[MCOMessageBuilder alloc] init];
[[builder header] setFrom:[MCOAddress addressWithDisplayName:#"Me" mailbox:#"user#domain.com"]];
[[builder header] setTo:#[[MCOAddress addressWithDisplayName:#"To you" mailbox:#"user#domain.com"]]];
[[builder header] setSubject:#"Mailcore test"];
[builder setTextBody:#"Message received"];
NSData * rfc822Data = [builder data];
MCOSMTPSendOperation *sendOperation = [smtpSession sendOperationWithData:rfc822Data];
[sendOperation start:^(NSError *error) {
if(error) {
NSLog(#"Error sending email:%#", error);
} else {
NSLog(#"Successfully sent email!");
}
}];