smtp2.umk.pl
smtp2.umk.pl has no DNS entries . The authorative whois server for the top level domain 'pl' is whois.dns.pl
DNS Records 
Whois for umk.pl
From server whois.dns.pl 1 week, 2 days ago (None):
VXNpbmcgc2VydmVyIHdob2lzLmRucy5wbC4KUXVlcnkgc3RyaW5nOiAidW1rLnBsIgoKRE9NQUlOIE5BTUU6ICAgICAgICAgICB1bWsucGwKcmVnaXN0cmFudCB0eXBlOiAgICAgICBvcmdhbml6YXRpb24KbmFtZXNlcnZlcnM6ICAgICAgICAgICBibGFja2JveC51Y2kudW1rLnBsLiBbMTU4Ljc1LjEuNV0KICAgICAgICAgICAgICAgICAgICAgICBrb2FsYS51Y2kudW1rLnBsLiBbMTU4Ljc1LjEuNF0KICAgICAgICAgICAgICAgICAgICAgICBuczIubWFuLnRvcnVuLnBsLiAKY3JlYXRlZDogICAgICAgICAgICAgICAyMDAxLjAxLjI1IDEyOjAwOjAwCmxhc3QgbW9kaWZpZWQ6ICAgICAgICAgMjAyNC4wMS4xNyAxNzoxMTo1MwpyZW5ld2FsIGRhdGU6ICAgICAgICAgIDIwMjcuMDEuMjQgMTM6MDA6MDAKCm5vIG9wdGlvbgoKZG5zc2VjOiAgICAgICAgICAgICAgICBVbnNpZ25lZAoKUkVHSVNUUkFSOgpjeWJlcl9Gb2xrcyBTLkEuCnVsLiBGcmFua2xpbmEgUm9vc2V2ZWx0YSAyMgo2MC04MjkgUG96bmHFhApQb2xza2EvUG9sYW5kCnRlbC46ICs0OC4xMjIuLi4KaW5mbyBhLnQgZG9tZW55LnBsCgpXSE9JUyBkYXRhYmFzZSByZXNwb25zZXM6IGh0dHBzOi8vZG5zLnBsL2VuL3dob2lzCgpXSE9JUyBkaXNwbGF5cyBkYXRhIHdpdGggYSBkZWxheSBub3QgZXhjZWVkaW5nIDE1IG1pbnV0ZXMgaW4gcmVsYXRpb24gdG8gdGhlIC5wbCBSZWdpc3RyeSBzeXN0ZW0K
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