Sending emails via Sendgrid, Gmail unauthenticated domain issue

  • 7 February 2024
  • 1 reply

Hey there.


I’m sending emails to customers (and we have a sendgrid api linked to, but our customers are receiving gmail emails with ‘unauthenticated sender’ which is really detrimentally affecting our open rates. 

I’ve authenticated and verified our domain on sendgrid, but also don’t know if this is the sole issue. 


I’ve also changed our SPF records from;


v=spf1 ~all

Tov=spf1 ip4:1P Address ~all


But the issue is still happening. 



1 reply

Userlevel 2

Hi Johnny,

Thanks for reaching out.

As far as I understand, you’re using a custom smtp set-up with Sendgrid rather than the default sending set-up with Unfortunately this means that we’re limited in what we can look into in terms of deliverability and it might be useful to see if Sendgrid can help you look into this.

If you’d like to switch to using our default sending set-up or have other questions about this, feel free to reach out to and we’ll be happy to help!