We have migrated to Office 365 and all is going well. But I cannot get our smtp server to send from everyone in the organisation.
In our organization we have a system that sends email using .asp pages and AspEmail which is Persits.MailSender. We want to send out emails with the from address of the user and not the admin.
I used this document http://support.microsoft.com/kb/2600912
and all seemed ok. I used the "Method 1:Use a mail-enabled security group"
But it still does not work.
In my words this is what I did.
I set up a group called SendAs. I added myself to it. I am admin. I added a user who needs to send as. I used my account to authenticate the smtp server.
if I send email from me all ok, otherwise we get a failure with
"smtp;550 5.7.1 Client does not have permissions to send as this sender "
Please can someone help.