On 24/01/2020 09:47, Gregory Heytings via mailop wrote:
jfoo.org. 6 IN MX 0 mx.oustrencats.com.
jfoo.org. 6 IN TXT "v=spf1 ip4:50.116.29.164
ip6:2600:3c00::f03c:91ff:fe6e:7287 -all"
This is not optimal, your SPF record should be "v=spf1 mx ?all".
I disagree.
"v=spf1 mx ..." requires a DNS lookup which their existing SPF record
doesn't. Lots of people telling you how to set up SPF will say 'use
v=spf1 mx' because they don't want to explain the entire SPF record
format, and the 'mx' mechanism works for a large proportion of people.
Using specific IP addresses is more 'optimised' than using 'mx'.
?all vs -all is all down to opinion.
Personally, I'd never use '?all' - that seems to be a "we're not sure
what we're doing yet" rule. ~all or -all is better IMHO.
--
Paul Smith Computer Services
Tel: 01484 855800
Vat No: GB 685 6987 53
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