Is this using some cloud-based email host where you don't have any control over the spam filter? Otherwise, whitelisting (verified) senders from your own dowmain should be very much possible.
E-Mail isn't some magic that randomly drops mails. Mail servers are even resilient against network problems and will retry dilevery MANY times. What you are describing is NOT normal and would make using it for business basically impossible, which is not the case since email is still the primary b2b communication method for many companies.
E-Mail isn't some magic that randomly drops mails. Mail servers are even resilient against network problems and will retry dilevery MANY times. What you are describing is NOT normal and would make using it for business basically impossible, which is not the case since email is still the primary b2b communication method for many companies.