Yii2 + yandex.connect - why does mail go to spam?

Question

C++ / C#

In general, there is a site on Yii2. Own domain, server. Connected mail to Yandex.Connect (improved "Mail For Domains").
Added SPF and DKIM records in dns settings:
v=spf1 ip4: server_ip address include:_spf.yandex.net ~all
v=DKIM1; k=rsa; t=s; p= long_key_dkim
Accordingly, on the server I send letters via Swiftmailer. Now I have added HTTPS to the site, and the mail began to either fall into spam (gmail), or not reach at all (mail.ru). What to do?
UPD: Obviously a problem with DNS. For some reason, Nginx incorrectly translates requests from http to https, and third-party servers do not see mx records

Answer 1

Collision does not have a tag field definition.
Write like this - if(coll.gameObject.CompareTag("WallG"))

Answer 2

In short, I got it.
It's just that the dns server suddenly stopped delegating my domain (let's say thanks to Vscale.io). Now I urgently transfer everything to other NS-servers.
And for those who will face the problem in the future, here are two testers for you:
https://www.mail-tester.com (thanks to Nikolai Petyukh for the link)
https://mxtoolbox.com/ (there is a "Find" button on the test page Problems")

Answer 3

mail starts or falls into spam

normal action of a spambot, a bunch of letters in a short period with strange content (you test obviously sending nonsense) from one address (this always happens during mail tests). Just add the sender to trusted.