Apply for whitelist (if you control your instance's mtas)
Get details from refusing domain administrators as to why emails generating from your instance is being refused and request whitelisting.
if hybrid solution, then involve deliverability team to act on your behalf and they will find out why email is being refused by the 1% of your population and possibly request whitelisting.
Raise a ticket to Adobe Support and get deliverability involved.
Apply for whitelist (if you control your instance's mtas)
Get details from refusing domain administrators as to why emails generating from your instance is being refused and request whitelisting.
if hybrid solution, then involve deliverability team to act on your behalf and they will find out why email is being refused by the 1% of your population and possibly request whitelisting.
Raise a ticket to Adobe Support and get deliverability involved.