[exim] too many connections

Hi,

what exactly causes this? Are these attacks? Would
"smtp_accept_max_per_host = 10" stop these?

Thanks



2006-06-21 10:25:06 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:06 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:07 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections
2006-06-21 10:25:08 Connection from [64.217.9.27] refused: too many connections