Hi Alberto! Email deliverability can definitely make or break your campaigns. A good starting point is to check your sender reputation using tools like SenderScore or Postmaster Tools. Make sure your SPF, DKIM, and DMARC records are properly set up to authenticate your emails. Since you’re tracking reply rates, also keep an eye on bounce rates and spam complaints—they can be strong signals of deliverability problems. Testing with seed lists and monitoring engagement over time can help you spot issues early. Hope this helps!

Hi John, if Mimecast is blocking your emails to multiple different companies, it could mean your domain or IP might be flagged as suspicious or your emails are triggering their spam filters. You might want to check your email content for anything that looks like spam, ensure your SPF/DKIM/DMARC records are properly set up, and consider reaching out to Mimecast support or the recipients’ IT teams to whitelist your address.