Retry time not reached

Hi I have many servers. I am using sengrid as mail relay on my servers. Some servers (from different host ) are sending well email but others do not work. After checking the exim mainlog here is the messge that I am getting: 019-11-08 01:36:45 1iT0Xv-0005m5-Fg == sc***l0@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSMzN-0002LA-07 == in***s@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.$ 2019-11-08 01:36:45 1iSJtu-0000fp-Gq == ***7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSJtu-0000fp-1s == crmontoya777@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iT0du-0005ol-WA == c***7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSJu8-0000j6-C1 == c***7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSJu8-0000j6-Gh == cr***7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSWRe-00075h-Ot == g***1@hotmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'hotmail.com' 2019-11-08 01:36:45 1iS6Et-0002m0-DK == san***01@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSJxt-0000lT-1t == c***7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSAPK-0004W3-JF == cr******7@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSN4K-0002NE-NG == ***@tietto.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'tietto.com' 2019-11-08 01:36:45 1iSAPO-0004Xh-R8 == ***ya777@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSAPO-0004Xh-Ni == ***ya777@gmail.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'gmail.com' 2019-11-08 01:36:45 1iSQF0-00040b-I8 == ***on@aol.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'aol.com' 2019-11-08 01:36:45 1iSQF0-00040b-I8 == ***nni@yandex.ru R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'yandex.ru' 2019-11-08 01:36:45 1iSWU0-00078d-M2 == g***@yandex.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'yandex.com' 2019-11-08 01:36:45 1iSQF0-00040W-F4 == el***t@yandex.com R=send_via_sendgrid T=sendgrid_smtp defer (-53): retry time not reached for any host for 'yandex.com' Please do you have any solution ?