Hi @MEceiza,
Are you referring to a conversations inbox in HubSpot where you are receiving emails from your contacts?
There are specific settings and rule for which emails land in the spam folder of a conversations inbox, you can review them under Settings > Inbox > Allow & Deny list.
HubSpot will automatically mark contacts as spam, by default, when the following things are true:
In the next couple of days, try to uncheck one of these boxes (and only one) each day and see if the issue persists. This will narrow down what the root of the problem could be. Once you’ve identified the issue, a solution might become apparent.
Or are you referring to your marketing emails landing in the spam folder of your marketing email recipients? If so, I have the following tips for you.
This is a common problem, unfortunately. Email service providers want to protect their own users. Could you confirm that you have connected your email sending domain and set up email authentification (SPF, DMARC)? Both are considered best practice and should help with your email deliverability and would be the first steps towards better deliverability.
In general, similar to SEO, you want to try to pass on as many positive signals about your content as possible. The eventual decision what to do with that content rests with the service provider. With that in mind, here is a list of things that I’d recommend reviewing:
Connect your email sending domain
Use a DMARC policy with HubSpot
Only email contacts who for whom you have a legal basis to communicate
Validate emails before sending to avoid hard bounces at all costs (e.g. Neverbounce, Zerobounce)
Remove unengaged contacts from list regularly for higher engagement rates
Avoid as many spam trigger words as possible
Test the spammyness of your email
Katie Burke wrote an excellent email deliverability listicle and Natsumi Mori also compiled a lot of great resources here. I highly recommend you check out both. Over time, email service providers should recognize you as a trustworthy sender. The issue could be that in the past, some recipients have already marked your emails as spam or that email service providers noticed high bounce rates from you.
Hope this helps!