Hi, frm.mwz,
With the current version of MailWizz (1.7.2), can you just paste in Settings/Email Blacklist all the domains as they're, or you need still to paste them as regex, like /(.*)@abc\.com/i?
Ostjya is the right guy to count on it. I worked with him several times, He´s fast and reliable and knows every aspect of MailWizz and MTAs like PMTA, PowerMTA an others.
@Osjtya did a very great job. He is a reasonable guy, very perceptive of what you need and always has a solution for the problem. He takes care of every task and perform every needed change untill everything works perfect. I'd recommend him to everybody.