The <>
at the end of "Company Name <some_email@domain.com>" <>
indicates that the address is interpreted as containing only the associated name part,with no real email address.
Try generating the From address as 'Company Name' <some_email@domain.com>
or as some_email@domain.com (Company Name)
Edit: Another possible reason for this problem is that your mailer is using separate fields for the name part and the address part of the From header. If so:
$mail->From = "some_email@domain.com";
$mail->FromName = "Company Name";
should solve the problem.