I have an exchange 2010 server running for the company very well.
Some of my users have also a "private home" account configured as POP3 in Outlook.
These account are external from the company, I mean the company is domain.com and the home account is theirisp.com
I would like to be able to allow them to send email with their home account using the smtp connector from exchange.
I have naturally setup the POP/SMTP account to use exchange host and use the port 587 using SSL. Anyway when I send a mail from the home account, exchange give me this error:
5.7.1 Client does not have permissions to send as this sender
I have googled and not find anything to setup the receive connector to allow that.
Does anyone know how to do?