Good day,
How are you?
I can take a look on how the emails are going out and check the configuration on the email server.
The only delay would probably be the response time from the blacklist service, but I'll work with them on clearing up why you are on the list.
I used to administer email servers and *build* this blacklists in-house, so I know my way around this process.
Sincerely,
John