SMTP protocol violation: synchronization error (next input sent too soon: pipelining

Dear All,
I found these error in mainlog of exim server and message to which this error is generated is being delivered to receiver incomplete.

Details :

SMTP protocol violation: synchronization error (next input sent too soon: pipelining was not advertised): rejected "" H=210.18.48.228.sify.net (anita) [210.18.48.228] next input="=20\r\n\r\nAmit, regarding infinity-data.com account - problem has been sorted out.\r\n\r\n=20\r\n\r\nRegards,\r\n\r\nAnita\r\n\r\n\r\n ----- Original Message -----=20\r\n "

What is the reason behind this and What are the solutions for the same ?


Thanks
Shrinivas.