WP Mail SMTP Test Email verification

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Hi,

I recently installed the WP Mail SMTP plugin and set it up using SendinBlue. I added all the DNS records except for DMARC and all records were successfully verified. However, when I perform the Email test, I get a notification telling me that the email was sent, but deliverability should be improved and action is required regarding SPF and DKIM as the appropriate records were not added to my domain.

I guess it’s worth noting that I followed these instructions and created a subdomain mail1.

I was wondering if you could provide me with guidance regarding this matter.

Thank you in advance for your help!