Email activation to spam

[vinasung]

Hi!

I'm using VPS at Ramnode, Install LEMP by manual on some sites.  Email activation to users only on spam. What can I do to get it into the inbox.

Thank you!

[LiroyvH]

Look at the headers (source) of the email, it may give you an idea why.
The usual suspects are: No rDNS (PTR) set (that actually resolves properly in both directions), no or wrong SPF records.