I have a Magento installation, and for certain recipients the transactional emails appear to be coming FROM something like [ftpUsername]@[servername.hostingcompany.com] on behalf of SENDER instead of just FROM SENDER. I hope that makes sense. How can I fix this ?
I know this has something to do with SMTP authentication or PHP mail but I cant find any such settings in magento and I don't know whether it's an issue with the magento settings, the server or the end users email clients. I also have a problem in that the mails send fine to all my own email accounts so I cant actually replicate myself it ( yet ).