So you are saying that Microsoft has nothing to do with what gets caught in
the Outlook Junk Email filter? Surely MS maintains the list of domains,
senders, subjects, etc. that are subject to that filter list.
The Outlook Junk E-mail filter looks at things other than the sender's address
and something about the way your mail service constructs the message appears
to be triggering the filter when your recipients receive your messages. It
may also be that they've misconfigured the Junk E-mail filter. If it's the
former, clearly it's not Microsoft's fault, but that of you or your mail
provider. If the latter, it's your recipients' fault and not that of
Microsoft. I do not accept as fact your contention that your domain is in the
Junk E-mail filter because there's no evidence that that is true. We don't
have enough information to decide what may be triggering the filter because
you haven't shared detailed information about your mail provider, your domain,
and how Outlook is configured to access that provider. All your recipients
should need to do it to add you to their Safe Senders list.
If you wish, send me a mail message at my gmail address and I'll see if my
Outlook determines if it's junk. My gmail username is the same as the
username on this message and the domain is, of course, gmail.com.