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netcup Documentation

SOGo Groupware

DNS Records

Learn more about the relevant DNS records for SOGo Groupware.

1. General Information

Record

Description

Host

Host name, e.g.,

  • @ = Root domain
  • * = All subdomains not explicitly configured 
    in the DNS (Wildcard)

Type

Record type, e.g., 

  • A = A-Record (Address Record)
  • AAAA-Record (IPv6 Address Record)
  • MX = Mail Exchange Record
  • TXT = Text Record
  • CNAME = Canonical Name Record

MX

For the MX type, a priority 
is set that determines the 
order in which mail servers 
are contacted for the delivery 
of emails.

Destination

Destination of the record.

valid

Validity of a record.

A-Record (Address Record)

Points a domain to an IPv4 address.

AAAA-Record (IPv6 Address Record)

Points a domain to an IPv6 address.

MX = Mail Exchange Record

Indicates the mail server for a domain.

TXT = Text Record

Stores textual information (often for verification or security purposes).

CNAME = Canonical Name Record

Clones the DNS of another domain.

2. Setting DNS Records

  1. Log in to the Customer Control Panel (CCP).
  2. Go to the Domains menu item.
  3. Click the Magnifying Glass Icon next to the desired Domain and switch to the DNS tab.
     

The following DNS records are relevant for SOGo Groupware. Please note that only the MX record is set automatically. You must enter all other records yourself:

  1. Indicates how the mail server can be reached:
    • Host: @
    • Type: MX (10)
    • Destination: my-domain-de.netcup-mail.de (my-domain-de is to be replaced)
       
  2. SPF (allows emails to be sent from the server specified in the A record and in the MX record, as well as from our mail relay. This makes it possible for third parties to recognize whether the email actually comes from the domain owner.):
    • Host: @
    • Type: TXT
    • Destination: v=spf1 mx a include:_spf.webhosting.systems ~all
       
  3. DKIM (adds a digital signature to ensure that emails have not been altered and come from the rightful sender.):
    • Host: key1._domainkey
    • Type: CNAME
    • Destination: key1._domainkey.webhosting.systems

       
  4. DKIM (adds a digital signature to ensure that emails have not been altered and come from the rightful sender.):
    • Host: key2._domainkey
    • Type: CNAME
    • Destination: key2._domainkey.webhosting.systems

Both DKIM records (key1 and key2) are required for complete security.

Note that the records will only work as intended if the default DNS settings are used and emails are sent exclusively via the product's mail server. Emails sent via alternative methods such as the web server (e.g., phpmail or sendmail) or an external mail server are excluded and not valid.

Last update: 22 April 2026

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