Hi,
We have planned to create SPF record in of our domain abc.com
Abc.com MX record is
Mail1.abc.com resolves to 203.6.164.5
Mail2.abc.com resolves to 203.6.164.6
We have trusted domain xyz.com we need to allow all mails from xyz.com to abc.com
Xyz.com MX record is
Mail6.xyz.com resolves to 143.8.156.5
Could you please help us which is correct one to create TXT record for SPF
abc.com. IN TXT "v=spf1 mx ip4:203.6.164.0/28 include: Mail6.xyz.com -all"
abc.com. IN TXT "v=spf1 mx ip4:203.6.164.0/28 include: 143.8.156.5. -all"
abc.com. IN TXT "v=spf1 mx a ip4: 203.6.164.5 a: 203.6.164.6 include: 143.8.156.5 -all"
Thanks & Regards, Kumar N