iot - SIM800L Email fail (DNS resolve error) -


when try send/receive emails sim800l gsm module responds: +pop3in: 62 (which means dns resolve error)

what wrong here?

i have tried 3 different service providers, 3 different email servers, , 2 different sim800 modules different firmware.

see command history here: history

20.08.2017 16:03:24.15 [tx] - at+creg?  20.08.2017 16:03:24.17 [rx] -  +creg: 0,1  ok  20.08.2017 16:04:07.01 [tx] - at+cgatt?  20.08.2017 16:04:07.03 [rx] -  +cgattt: 1  ok  20.08.2017 16:04:26.98 [tx] - at+sapbr=3,1,"contype","gprs"  20.08.2017 16:04:27.02 [rx] -  ok  20.08.2017 16:04:29.37 [tx] - at+sapbr=3,1,"apn","internet"  20.08.2017 16:04:29.40 [rx] -  ok  20.08.2017 16:04:39.69 [tx] - at+sapbr=1,1  20.08.2017 16:04:40.36 [rx] -  ok  20.08.2017 16:04:42.78 [tx] - at+sapbr=2,1  20.08.2017 16:04:42.80 [rx] -  +sapbr: 1,1,"10.142.235.73"  ok  20.08.2017 16:04:47.32 [tx] - at+emailcid=1  20.08.2017 16:04:47.35 [rx] -  ok  20.08.2017 16:04:48.43 [tx] - at+emailto=30  20.08.2017 16:04:48.45 [rx] -  ok  20.08.2017 16:04:53.42 [tx] -at+pop3srv="mail.baumtronics.com","xxx@baumtronics.com","",110  20.08.2017 16:04:53.46 [rx] -  ok  20.08.2017 16:05:07.55 [tx] - at+emailssl?  20.08.2017 16:05:07.57 [rx] -  +eemailssl: 0  ok  20.08.2017 16:05:14.70 [tx] - at+pop3in  20.08.2017 16:05:14.72 [rx] -  ok  20.08.2017 16:05:15.74 [rx] -  +pop3in: 62  20.08.2017 16:06:04.97 [tx] - at+pop3srv="s10-london.accountservergroup.com","xxx@baumtronics.com","xxx",995  20.08.2017 16:06:05.03 [rx] -  ok  20.08.2017 16:06:16.86 [tx] - at+emailssl=1  20.08.2017 16:06:16.87 [rx] -  ok  20.08.2017 16:06:20.76 [tx] - at+pop3in  20.08.2017 16:06:20.77 [rx] -  ok  20.08.2017 16:06:21.52 [rx] -  +pop3in: 62


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