email DNS records

I use several third party softwares, to allow them to email on my domain's behalf I have to add records to my domain.
The problem I have is that two are trying to use the same host:

Data:  XXX

The domain manager won't let me add the second because there is an existing one with the same 'host' information.
How can I add both using the same Host info ?
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Are you referring to the SPF record?
Post link to a solution for one of the vendors.
AleksAuthor Commented:
They don't have a solution.

The record is:  CNAME

The second vendor whats to use the same CNAME host record but has different data.
Post the link to web page in which they describe what you need to do in your DNS.
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ChrisSenior Technical ArchitectCommented:
its looks like you are trying to allow DKIM signing. which means you would have to provide those 3rd parties with your DKIM private key.
As a good practise you are better off delegating a subdomain for 3rd email relay i.e. or

can you be more clear on what you are trying to do

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AleksAuthor Commented:
I ended up talking to the software provider and they will try to use alternate records.
AleksAuthor Commented:
Delegated to the provider to use different records.
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