Check Mail Integration active still integration
Below sql check to integration work or not
select column41479,column41480,column41481,column41482,column41483,column41484,id from table2139 where date(column41486)>=date(now());
Suppose you want increase date in integration then go following steps;
Pre Sales --> Enquiry Sources --> Click on Enable Inbound Mail -- > Open dlist and put Valid Till Date greater than today