I've set up SPF and DKIM, and I have DMARC configured correctly. My domain is warmed up, and everything works fine for Gmail. However, I'm having a lot of trouble with Yahoo and Hotmail where emails get flagged with `550 high-probability spam` or I receive random complaint reports from Yahoo. I'm wondering if this could be due to stricter filtering on their end in 2025, or if I might be overlooking something important in my setup.
1 Answer
It's really important to consider your SMTP server when sending emails. If you're using a well-known email provider, their IPs usually have a better reputation and are more likely to get through to services like Yahoo and Hotmail without issues. Since you're using SendGrid API, that should generally be okay, but make sure the sending reputation is strong too!
We’re actually using the SendGrid API, not SMTP.