It is possible that your company's computer filters do not accept receiving emails from its own domain name (the sender's domain name is the same as the recipient's domain name.).
To correct this situation, you need to add the sender's IP address to the "whitelist".
The IP addresses we use in North America are as follows: between 184.108.40.206 and 220.127.116.11.
In Europe, the sequence is between 18.104.22.168 à 22.214.171.124.
You must include the entire sequence, which sums up to 255 IP addresses.