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Before you can send and receive email with Open-Xchange, you need to add the required DNS records to your domain. These records are displayed in the customer portal under the DNS Settings tab of your service.

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Accessing DNS Settings

  1. Log in to the customer portal
  2. Go to Services → My Services
  3. Click your Open-Xchange service
  4. Click Manage Email Accounts
  5. Select the DNS Settings tab

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Required Records

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MX Records

Add all four MX records with priority 10:
TypePriorityValue
MX10mx001.cloudus.xion.oxcs.net
MX10mx002.cloudus.xion.oxcs.net
MX10mx003.cloudus.xion.oxcs.net
MX10mx004.cloudus.xion.oxcs.net

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SPF Record

Add a TXT record on your domain’s root: 
v=spf1 include:spf.cloudus.oxcs.net ~all
If you already have an existing SPF record (e.g., for another email service), merge them into a single record. SPF only allows one TXT record per domain. For example: 
v=spf1 include:spf.cloudus.oxcs.net include:_spf.google.com ~all

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DKIM

Open-Xchange automatically signs all outgoing email with DKIM. No DNS changes are required on your end.

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DMARC Record

A suggested DMARC record is shown in the DNS Settings tab. Add it as a TXT record on _dmarc.yourdomain.com: 
v=DMARC1; p=quarantine; rua=mailto:postmaster@example.com; ruf=mailto:support@example.com; fo=1; pct=100
Replace the rua and ruf email addresses with your own. These addresses receive aggregate and forensic DMARC reports, respectively.
If you are setting up DMARC for the first time, consider starting with p=none to collect reports before enforcing a stricter policy. See the SPF, DKIM & DMARC guide for a recommended rollout strategy.

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Verifying DNS

After adding your records, allow time for DNS propagation (typically a few minutes to 48 hours, depending on TTL). You can verify your records using MXToolbox or the diagnostic tools listed in the SPF, DKIM & DMARC guide.