Domain has no DMARC/DKIN/SPF etc

Hi all I have started a new job several months ago in sales and I feel like I am being gaslighted by multiple employees and am hoping someone can clarify for me.

I have a client list of about 15,000 contacts and when I email them through my mail merge I have been getting maybe 3-4 replies, tops.

I check the open rates and they are good however recently I’ve read that is mostly vanity metrics as so many spam filters open the emails and even click links.

Recently I ran a diagnostic using MXtools on the domain and my email address.

I got several errors, no certificates for DMARC DKIN and SPF whatever that is ??

The diagnostic says this is causing my emails to go directly to spam.

Is this true ??

Our IT department says it’s not a big deal or necessary to have these things. But I’ve read not having them affects deliverables and also it allows scammers to spoof our emails (we definitely get that at this company.)

Not only that, but the marketing consultant on the other side of the country says that none of that matters at all and that I just need to get used to how difficult the marketing and sales is for this company.

Any advice is sorely needed - I feel very lied to about the reality of this situation and it’s greatly affecting my performance.

Also, when IT was asked to fix these issues, they said they would, they never did, and then when we tried again they admitted they had no access to the domain, that some other consultant has that info.

Mind you, that was the head of IT.

Does this not all seem a bit strange ?

We are a 90 million company, also.