Shouting into the #IT void. For some reason I can't get a webmail client, hosted locally to the email server to send mail through it. The problem seems to be that the webmail clients are not sending authentication data. I've tried with #roumdcubemail and #SnappyMail and neither work. My mta is #exim. Same user details work on Thunderbird, my phone, desktop email clients. I can't work out what I'm missing!!