1 Topic by bluepuma77 (edited by bluepuma77 2020-12-03 23:50:37)

  • bluepuma77
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Topic: How to handle DNS, PTR, SPF, DKIM and DMARC for a subdomain?

Hi all,

I would like to run a secondary email server on mx.domain.tld with email info@mx.domain.tld for transactional emails like registration and appointments. I want to leave the regular email server for domain.tld untouched, it should continue as usual.

I checked the official docs about all the DNS settings (https://docs.iredmail.org/setup.dns.html), but I am unsure how to set PTR, SPF, DKIM, DMARC for a subdomain.

Reverse PTR: this can probably work
SPF: setting "mydomain.com" would probably influence my regular mail server. Can I use a subdomain here?
DKIM: setting "dkim._domainkey.mydomain.com" would probably mis-match with the regular mail server. Can I use a subdomain here?
DMARC: setting pure "DMARC" would probably influence my regular mail server. How to set a subdomain?

Is it even possible to set up info@mx.domain.tld which will not be placed directly in spam?

I think it would be great to add the info to the docs.

Cheers
bluepuma

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Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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  • Posts: 31,088

Re: How to handle DNS, PTR, SPF, DKIM and DMARC for a subdomain?

Just replace the main domain name like "example.com" by "sub.example.com" while setting up DNS records for mail domain name "sub.example.com".