550 Sorry, your HELO/EHLO greeting must resolve (#5.7.1)
To resolve this issue you can enter an FQDN in windows and the problem will go away.
In Windows XP
Click START
Click Control Panel
Click Network Connections
Right Click your Internet Connection
Click Properties
Click Internet Protocol (TCP/IP) then click Properties
Click Advanced
Click the DNS tab
In the field titled "DNS suffix for this connection:" enter mail.yourdomain.com
Substitute yourdomain with the domain of your email address
You will be able to send email as normal
For Windows 7 follow these instructions
Click the Start/Windows Button
Click Control Panel
Click "View network status and tasks"
Click Change Adapter Settings
Right Click your network connection and click Properties
Click on "Internet Protocol Version 4 (TCP/IPv4)" and click Properties
Click Advanced
Click the DNS tab
In the field titled "DNS suffix for this connection:" enter mail.yourdomain.com
Substitute yourdomain with the domain of your email address
You will be able to send email as normal
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