550 5.7.1 Client does not have permissions to send as this sender (office365)

Question

i m trying to send email with following configuration

Host: smtp.office365.com

port: 587

user: \"myemail@domain.com\"

pass: \"mypassword\"

Answer 1

Answer provided by Luis Cruz is the right one.. However, I will try to be more descriptive though,

We were trying to send mail in Mantis Bug Tracker through Office 365 account and were facing the same issue. Below was the config,

$g_enable_email_notification = ON;
$g_phpMailer_method          = PHPMAILER_METHOD_SMTP;
$g_smtp_host                 = 'smtp.office365.com';
$g_smtp_username             = 'abc@acme.com';
$g_smtp_password             = '****';
$g_smtp_connection_mode      = 'tls';
$g_smtp_port                 = 587;

Clearly what we were missing was the 'from' property. Adding following properties resolved the issue,

$g_from_name               = 'Mantis Admin';
$g_from_email              = 'abc@acme.com';
$g_return_path_email       = 'abc@acme.com';