I have a zimbra installed and working fine. The main domain is mbox.dominiocorp.com.br (fictitious).. I have SPF, DKIM, _dmarc, reverse configured and tested. The emails of the domain mbox.dominiocorp.com.br enter the inbox. I added two more domains on top of this zimbra (dominiocorp3.com.br and dominiocorp4.com.br). Both have been configured their SPF, DKIM, _dmarc and the reverse of these domains is the IP of the domain mbox.dominiocorp.com.br. All emails from new domains, are going to the box SPAM of gmail, yahoo, hotmail. I see in the original message that SPF and DKIM are correct, without errors.
dig -t txt mbox.domaincorp.com.br
mbox.domaincorp.com.br. 300 IN TXT "v=spf1 mx ip4:18.104.22.168 -all"
dig -t txt domaincorp3.com.br
domaincorp3.com.br. 84600 IN TXT "v=spf1 a mx ip4:22.214.171.124/29 ~all"
dig -t mx domaincorp3.com.br
domaincorp3.com.br. 84600 IN MX 5 mbox.domaincorp.com.br.
dig -t mx mbox.domaincorp.com.br
mbox.domaincorp.com.br. 84600 IN MX 5 mbox.domaincorp.com.br.
mbox.domaincorp.com.br has address 126.96.36.199 mbox.domaincorp.com.br mail is handled by 1 mbox.domaincorp.com.br.
domaincorp3.com.br has address 188.8.131.52 domaincorp3.com.br mail is handled by 10 mail.domaincorp3.com.br.
184.108.40.206.in-addr.arpa domain name pointer mbox.domaincorp.com.br
Could anyone tell me what might be happening? Is it any configuration due to IP being shared? Or any add-on settings that I need to perform on zimbra?
I've read that the zimbra antispam itself might be punctuating this domain as bad. Does it proceed? By sending an email to email@example.com I received the result below.
Here's a link with the original header and the answer from firstname.lastname@example.org