Do not send mail by means of php mail ()
letters hangs in the queue .
log file
Oct 6 00:41:12 VM1 send: delivery 13 : deferral: Connected_to_217.69.139.150_but_my_name_was_rejected. / Remote_host_said: _500_Syntax_error /
Oct 6 00:35:47 VM1 send: delivery 5: failure: Sorry,_I_couldn't_find_any_host_named_VM1.VM1._(#5.1.2)/
Oct 6 01:12:36 VM1 send: delivery 2: deferral: Connected_to_94.100.180.150_but_my_name_was_rejected./Remote_host_said:_500_Syntax_error/