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

There can be many reason for this issue, One of this is which is most frequently comes because

Login name and From address is not same.

Login = 'abc@gmailcom' FROM = 'abc@gmailcom'

Now use these variables, It will work.