My website was previously on a **windows server A** with ip `79.137.24.248` but my mail server was on a Linux hosting with ip of `185.81.99.111`. There were three DNS record that were connecting these two servers:

1. Name: `example.com.`<br>
   Type: `MX`<br>
   Data: `mail.example.com.`
2. Name: `mail`<br>
   Type: `A`<br>
   Data: `185.81.99.111`
3. Name: `example.com.`<br>
   Type: `TXT`<br>
   Data: `v=spf1 mx a ip4:79.137.24.248/32 ~all`

Now I have moved my website on a new **windows server B** with ip `185.10.75.6` but I want to keep the mail server on that Linux server. On the new server I have set `MX` and `A` records exactly as same as previous ones but for `TXT` record I am confused. What should I do? Which server is responsible to translate the TXT record? Should I add the TXT record on **new server B** or add a new TXT record on **old server A** to allow the new IP using that mail server?

**Footnote:** `mail.example.com` is now loading fine but when I try sending/receiving emails it seems that the new IP is now allowed to communicate with the Linux mail server.