How to prescribe SPF? Are prefixes needed in SPF records?

Question

SPF

How to create spf for 30 domains. For auxiliary system 29
The spf request limit is 10.
I have dnsmta.xyz / dnsmail.xyz / dnssis.xyz
for example on the client domain domain.ru we request spf in dnsmta.xyz / dnsmail.xyz / dnssis.xyz via redirect
where each of dnsmta.xyz / dnsmail.xyz / dnssis.xyz has permission entries for its server group, for example
dnssis.xyz IN TXT v=spf1 ip4:95.46.114.185 ip4:95.46.8.104 ip4:78.108.95.160 ip4:78.108 .82.196 ip4:93.170.123.71 ip4:95.46.8.188 ip4:178.250.241.129 ip4:93.170.123.238 ip4:31.148.99.113 ip4:31.148.99.161 ~all
and calculate the number of requests in this case . Will such a design work?
I see some domains have spf redirect and include with a prefix. How to
spell v=spf1 redirect=spf.dnsmta.xyz
v=spf1 redirect=_spf.dnsmta.xyz
v=spf1 redirect=dnsmta.xyz

Answer 1

ip4/ip6 does not require an additional request, so they are the best to use..
each 'redirect', 'include' requires an additional request + all requests of the include zone
'a' require 1 additional request
'mx' will require 1 request to get the MX-list records + 1 additional query per MX record.
About the use of redirect and include, and in general, recommendations on your question are quite detailed here (toward the end).