Listing in the ivmSIP/24 blacklists indicates that your IP Address has been identified as a spam-sending server. Whether or not you operate an email-server on this IP Address, it has either sent spam or has been previously identified as such.
Are you confident your email is getting through?
You rely on email for business critical communication, so you need to know your email has been delivered to your customers and you need to know who is sending email on your behalf.
MxToolbox is YOUR expert on email deliverability. MxDelivery Center analyzes 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 inboxes.