Question and response
Question
dig spfb.zixcorp.com. TXT
Answer
spfb.zixcorp.com. 300 TXT "v=spf1 include:zix.spf.smtp25.com include:mktomail.com include:spf.protection.outlook.com include:_spf.salesforce.com"
Authority
zixcorp.com. 300 NS ns03.zixcorp.com.
zixcorp.com. 300 NS ns01.zixcorp.com.
zixcorp.com. 300 NS ns02.zixcorp.com.
Additional
ns01.zixcorp.com. 300 A 63.71.8.12
ns02.zixcorp.com. 300 A 63.71.9.12
ns03.zixcorp.com. 300 A 74.203.184.12
ns01.zixcorp.com. 300 AAAA 2620:12d:6000:53:0:0:0:53
ns02.zixcorp.com. 300 AAAA 2620:12d:6001:53:0:0:0:53
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0