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So I've been having mail problems for quite a while now, and it's just too much. Users from sites like gmail, hotmail, yahoo are reporting not even receiving my emails in their spam folder. I have my DNS records for SPF and DKIM set up, so I don't know why this is happening. And I need this fixed asap

Example from the mail logs

----- The following addresses had permanent fatal errors -----
<[email protected]>
    (reason: 550-5.7.1 [2a00:d880:5:a96::4eb7] Our system has detected that this message does)

  ----- Transcript of session follows -----
... while talking to gmail-smtp-in.l.google.com.:
>>> DATA
<<< 550-5.7.1 [2a00:d880:5:a96::4eb7] Our system has detected that this message does
<<< 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and
<<< 550-5.7.1 authentication. Please review
<<< 550-5.7.1  https://support.google.com/mail/?p=IPv6AuthError for more information
<<< 550 5.7.1 . w27si3773289edi.382 - gsmtp


Also apparently because some random people reported my site on Yahoo, it just doesn't send emails to millions of yahoo users?

----- Transcript of session follows -----
... while talking to mta7.am0.yahoodns.net.:
>>> MAIL From:<[email protected]> SIZE=2132 BODY=8BITMIME
<<< 421 4.7.0 [TSS04] Messages from 176.56.238.100 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
... while talking to mta5.am0.yahoodns.net.:
>>> MAIL From:<[email protected]> SIZE=2132 BODY=8BITMIME
<<< 421 4.7.0 [TSS04] Messages from 176.56.238.100 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
... while talking to mta6.am0.yahoodns.net.:
>>> MAIL From:<[email protected]> SIZE=2132 BODY=8BITMIME
<<< 421 4.7.0 [TSS04] Messages from 176.56.238.100 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
<[email protected]>... Deferred: 421 4.7.0 [TSS04] Messages from 176.56.238.100 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

You do not have rDNS setup for your ipv6 address
https://mxtoolbox.com/SuperTool.aspx?act...tworktools

Looks like you are using mailstamp.io ?? to send your emails at least ipv4?

I didn't install the mail software. Is there a way I can check? How would I fix this problem?

You would contact your host/server provider to setup rDNS correctly on your sending ip's

I use an "unmanaged host" are you sure its not something I could do relatively easily?

rDNS has to be setup by the host or check your control panel for your unmanaged host and see if they have rdns option

Ok so "rDNS" exists in their control panel. But what do I have to do?

the entry should match your domain name and do one for ipv6 as well

From the support page "Enter your FQDN in standard format (server.yourdomain.com).

Note: If you are using CloudFlare, our system will not detect the necessary A-Record pointing your domain to our IP(s). Please disable CloudFlare, set up your RDNS, and then re-enable it. "

So I just put my domain name in the rDNS settings? What exactly does that do can you explain it.

Yes that's for email delivery
Read more on https://en.wikipedia.org/wiki/Reverse_DNS_lookup