Hi @hempsell
I see from the error you’re using a Yahoo email address, but I’m guessing you’re not using Yahoo’s mail servers?
Because QuickFile uses it’s own mail servers, instead of (in this case) Yahoo’s, the email is being rejected. What I’d recommend is use Yahoo’s SMTP email server.
This article may be of help to you:
http://community.quickfile.co.uk/t/improving-email-reliability/8904
If you need help setting up the SMTP settings on QuickFile, please let us know 