Correct SPF settings if the domain mail server and sender are different?

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There is a mail server mail.server.com. Through it sent letters from the box info@company.com.
In this case, to correctly configure SPF for a domain?
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For company.com in spf you need to sincluding mail.server.com
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Your address plus all the addresses mx and a records
v=spf1 ip4:136.243.82.21 ip4:136.243.82.20 +mx +a ~all


your IP and SPF record Yandex
v=spf1 ip4:136.243.82.21 ip4:136.243.82.20 include=_spf.yandex.ru ~all
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You need to configure SPF for a domain used in the envelope-from, usually, the email and this address shows as the reuturn-path. If it coincides with info@company.com to publish SPF it is necessary for him, but ucast IP address (or addresses) of the server

company.com. TXT "v=spf1 ip4:1.2.3.4 ~all"

where 1.2.3.4 is the server address. You can use and design

company.com. TXT "v=spf1 a:mail.server.com ~all"
but it is preferable to use IP addresses.
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