Do I need to register IP senders in SPF?

Question

SPF

Good afternoon.
I got a little stupor with the SPF setting. There is mail delegated to yandex. We carry out mailings, sending is done through a certain client (the client is on our side), which logs in to the Yandex server and sends letters through it, while the IP address of our company is recorded in the Message-ID field (+ our address is in the unsubscribe line) .
The question is, in this case, should I leave the SPF record like "v=spf1 redirect=_spf.yandex.net" or should I add the IP of our company?

Answer 1

it is necessary to register in SPF IP addresses from which MTA transfers mail. if mail is sent through the Yandex server, nothing needs to be changed. you need to change if you need to forward from the client (the client connects directly to the recipient's MTA)

Answer 2

no you have to look in smtp configuration. SP is fully right