10:30:50 [76049] RSP: 221 bay0-mc2-f15.bay0.hotmail.com Service closing transmission channel
10:30:50 [76049] Delivery for sharpey@mydomain.com to xxxxxxxx@hotmail.com has completed (Delivered)
10:30:52 [76049] Delivery finished for sharpey@mydomain.com at 10:30:52 [id:41876049]
Apparently it's been delivered, but never appears in the inbox? 
All the mail contains is;
subject: test
body: hello
Although if I send the exact same email, but attach a picture, it gets delivered (same message as above) and also appears in my inbox.
I'm not sure I've got my DNS records for the domain configured entirely correctly, but I have got a FQDN for the server name and an SPF record configured for the sending domain.
Anyone else had the same issue? Found a fix? Make a man happy and spread the knowledge please..... 