Today, I signed up for Alamy and uploaded the first 3 images from the URL below, but I was rejected by "Unsuitable Camera". https://www.alamy.com/myupload/Index.aspx
The minimum image sensor size in "Alamy ’s rough guide to digital cameras" is said to be recommended by four thirds sensors,
The sensor size of my camera (sigma dp1 merrill) is APS-C (23.5 × 15.7mm).
By the way, the EXIF information of the file excluding the shooting information is as follows.
Camera: SIGMA DP1 Merrill
EXIF version: 0230
Color space information: sRGB