The three records every sending domain needs, and how to check them.
Under Insights → Deliverability, "DNS Settings" checks your sending domain.
SPF lists who may send for your domain. Add Artra’s include and your mail provider’s.
DKIM signs each email. Your provider gives you the TXT record to add.
DMARC tells receivers what to do when SPF or DKIM fail. Start with p=none.
Click "Double check" to verify DKIM on a real email.
Send yourself a test, open it, choose Show original, paste the source here and click Analyze.