Can I enter two "s1._domainkey" CNAME records or is that technically not possible?

Hello

Challenge: Sending Emails from the same domain with two different applications using both SendGrid - Conflict with similar CNAME Records:

I should enter

s1._domainkey
s1.domainkey.u161779.wl030.sendgrid.net
s2._domainkey
s2.domainkey.u161779.wl030.sendgrid.net

AND

s1._domainkey
s1.domainkey.u7797592.wl093.sendgrid.net
s2._domainkey
s2.domainkey.u7797592.wl093.sendgrid.net

but that returns an error message

Record already exists with that host (Code: 81053)

Before I resign and sacrifice one service for the other I would like to ask if I can somehow let these two records co-exist

Even if you could (which you can’t), it would theoretically round-robin the two and give the wrong result half the time.

Can’t you move one to a subdomain? For example, I use a ‘list’ subdomain for one of my Sendgrid senders.

You can get SendGrid to use a different DKIM selector for each account, such as :

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