Why are mail.ru emails in spam?

Question

Email

Can it be that all letters sent from one mail.ru mailbox to different users at different times and with different content (not mass mailing) to all recipients ended up in spam for some reason? All recipients had not personal, but corporate mail and ended with .ru. At first, the letters did not reach and there was a notification about an undelivered letter from the system. Then for some reason everything started to go normally. But even to my question in the letter, they say, is it possible to contact someone through you, no one answered me.
It must be said that:
1. The name of the box is not ivanovivan, but an unusual phrase in Latin. Could this be the problem?
2. I wrote my username as unknown user. This is how it comes to people. Could this be the problem?
3. I wrote all letters with the VPN turned on. Does it somehow affect?
4. Or is the problem in the mail or receiving boxes?

Answer 1

At first, the letters did not reach and there was a notification about the undelivered letter from the system

if the server is yours or a friend's ( show your friend ), then learn to look at the logs
, and if not yours, the admin learns to configure there, accept life as it is