My account activation mail went to the Spam and was marked suspicious. When I opened the message, Gmail displayed a header box on an orange background:

Be careful with this message

Gmail could not verify that it actually came from gbadev.net. Avoid clicking links, downloading attachments, or replying with personal information.

"Show original" in Gmail said SPF failed and DMARC failed.

(I created this in the wrong area. Could a moderator move it to site feedback?)

Thanks for the heads up! I'll get @avivace to take a look as he's the one with access to the mail server.

We pushed some changes on the mail server. @PinoBatch can you retry and see if gmail still flags them like that? (e.g. try to request a password reset)