Been a while since I had to post on here, but run into a little problem. Having got fed up constantly fighting and troubleshooting email delivery due to overenthusiastic spam filter I decided to "outsource" outgoing mail. I'm trying Sparkpost and it seems to work fine for everything except aMember. Whenever I send a test message I get "Error during e-mail sending: Zend_Mail_Protocol_Exception:5.7.8 Sorry." I've tried port 2525 as they also receive on that, but no lock. It's not down to firewall on server as ports 587 and 2525 are open. Settings in attrached image
Please check this page https://support.sparkpost.com/customer/portal/articles/1988470-smtp-connection-problems Do you use correct From email? Is it match one of the verified sending domains you've configured in your SparkPost account?