We were able to connect to your email server on port 25. Your server either disconnected before we sent our final QUIT command or did not respond to one of our other diagnostic commands within 15 seconds.
This may be due to a network problem, or could be an anti-spam feature of your email system. On it's own this warning does not point to any specific problem, but can be helpful in diagnosis when combined with other errors.
Are you managing your email delivery?
Email delivery is more than running an email server, or regularly checking for blacklists. To really ensure you customers get your email, you need to setup SPF, DKIM and DMARC. If you aren't manage your DMARC configuration and responses from email providers, you don't know if your customers are getting your email.
MxToolbox is YOUR expert on email deliverability. MxDelivery Center can help you setup and analyze your DMARC, DKIM and SPF to give you the insight you need to make email configuration changes and get your emails to your customer's.