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:

Host: s1._domainkey.mydomain.pro
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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AleksAsked:
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RoninCommented:
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
Host:  s1._domainkey.mydomain.com
Data:  XXXXXXXXXXXXXXXXXXXXXXXXX

The second vendor whats to use the same CNAME host record but has different data.
RoninCommented:
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. survery.domain.com or recuruitment.domain.com

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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