There are multiple ways to define multiple ip addresses in SPF. But you need first to contact IONOS support and find how what they use for outgoing ip addresses and I would bet you that they already know what you should put in your SPF record.

Lyle Giese

On 2/5/23 18:13, H via mailop wrote:
I have a domain with multiple email addresses hosted by Ionos. I have found 
that outgoing emails can come from a range of Ionos email IPs.

I have created a TXT record for my domain containing one IP4 address but 
outgoing emails seem to be sent from different IP4 addresses. As an example I 
now have:

v=spf1 a mx ip4:74.208.4.194 ~all

I know I can add at least one more ip4 address using the same format but I am 
not sure exactly what the Ionos email ip range might be so:

- Is there a way of saying eg. ip4:72.20.8.*

- Or should I delete the ip4 component and instead add:

include:mydomain.tld (corrected of course)

Suggestions appreciated!

Thanks.

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