imtl.skku.ac.kr.	30 IN TXT "v=spf1 ip4:115.145.179.53 ip4:115.145.172.20 ~all"

imtl.skku.ac.kr.	30 IN A	115.145.174.250

Mail exchangers:
imtl.skku.ac.kr.	30 IN MX 20 imtl.skku.ac.kr.