Vps link, is seen as spam

Hello there!

I have a link for meeting.
My link is something like this one: https://vpsxxx.viewdns.net/xxxxxxx

I am trying to send it via mail, but my emails are blocked.
I get back this message: Remote host said: 552 5.2.0 gx2p2200S09x73e01x2rbz spam detected.

I even tried to short the URL, but the shortner link generator, after a while delete my url because it sees it as spam.

How can I solve this?
thanks in advance
denis