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Christovam
Asked: 2017-12-09 12:29:58 +0800 CST

Zimbra with multiple domains - SPAM

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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 ip4:177.222.222.222 -all"

dig -t txt domaincorp3.com.br

domaincorp3.com.br. 84600 IN TXT "v=spf1 a mx ip4:177.222.222.222/29 ~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.

host mbox.domaincorp.com.br

mbox.domaincorp.com.br has address 177.222.222.222 mbox.domaincorp.com.br mail is handled by 1 mbox.domaincorp.com.br.

host domaincorp3.com.br

domaincorp3.com.br has address 177.222.222.222 domaincorp3.com.br mail is handled by 10 mail.domaincorp3.com.br.

host 177.222.222.222

222.222.222.177.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 protected] I received the result below.

Here's a link with the original header and the answer from [email protected]

https://docs.google.com/document/d/1Mncx-dpufm1-7plfxAV9sqRyzDCS2OSTBn-W3NWeGyg/edit?usp=sharing

postfix

1 Answers

  1. It is becoming increasingly difficult to establish and maintain reputation for standalone mail servers when dealing with the large mail providers. Among the things you have to consider are whether your server, or IP address or indeed netblock are on RBLs, which can be a legacy issue from previous users of the address. Also ensure that your configuration matches your IP address, particularly that your HELO address resolves to the sending IP address. Zimbra itself can be hard to debug for inbound mail so turn on logging in the setup stage.

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