OVH MX Plan, multisite and DKIM on secondary domain

E-mails
,
1

Hello,

I have an OVH Pro hosting with multiple domains attached in multisite to the same web hosting.

My main domain has an active MX Plan.

I also have several other domains attached in multisite to the same hosting, but without a dedicated MX Plan.

The problem is as follows.

I can use email redirections on a secondary domain, but I cannot create a real mailbox on that domain without subscribing to a new MX Plan.

Currently:

  • emails are sent from Thunderbird ;
  • via the OVH SMTP of a mailbox linked to the main domain ;
  • with a sender identity using the secondary domain.

The SPF and DMARC are correct, but Mail‑Tester indicates that the emails are not signed with DKIM for the secondary domain.

DKIM is active on the main domain, but not on the secondary domain, since it does not have its own MX Plan.

My question is therefore the following.

Is there a method to:

  • attach a secondary domain to the existing MX Plan of the main domain ;
  • or create a real email address on this secondary domain ;
  • without having to subscribe to a new full MX Plan for each domain?

I find it quite limiting to have multisite hosting, but email management restricted to the main domain.

The goal is simply to have:

  • a real mailbox on the secondary domain ;
  • a correctly aligned DKIM ;
  • without multiplying MX Plan subscriptions while all domains already use the same OVH hosting.

Thank you in advance for your help.

2

Hello,

You should purchase MX5 or MX25 for each of your subdomains. There is a one‑time payment to make.

I don’t see any other solution.

You won’t have a DKIM signature for a “spoofed” email address. A DKIM signature is proof of authenticity, and a spoofed email can be produced by anyone.

3

Thank you for your response.

Indeed, I understand the issue regarding DKIM and the fact that an identity using a different domain is considered “spoofed” from the signature’s perspective.

I eventually found a workaround by enabling the free Start100M hosting on the secondary domain, which provides a real email address and thus a properly aligned DKIM.

But I still find the behavior rather inconsistent.

When you have OVH multisite hosting that lets you host multiple domains on the same server, you would expect to be able to manage multiple mail domains as well without having to subscribe to a separate MX for each.

Perhaps the new Zimbra infrastructure addresses this need, but having been an OVH customer for a long time, I am still on the old MX Plan system.

Thanks again for the explanations.