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Let's suppose I have a domain named example.com. I'm using sendgrid to only send/track emails and zoho as a mail server.

I already have these records and Everything works fine:

example.com     1799    IN  MX  10 mx.zoho.com.
example.com     1799    IN  MX  20 mx.zoho.com.
example.com     3599    IN  TXT "v=spf1 a include:sendgrid.net include:zoho.com ~all"
zohomail._domainkey.example.com. 1799 IN TXT    "v=DKIM1\; k=rsa\; p=......."

Now I want to whitelabel my domain to get rid of the “via sendgrid.net” message. They want me to add another MX record but for the subdomain:

MX  delivery.example.com mx.sendgrid.net.
TXT m1._domainkey.example.com k=rsa; t=s; p=...
TXT delivery.example.com v=spf1 include:sendgrid.net ~all

I know that you shouldn't use different MX servers for the same domain, but how about subdomain (same question for SPF and DKIM records)

Edit:

I'm also worried if what I'm doing is considered as spam, for further info A and CNAME records are set like this:

example.com.        1799    IN  A   my_IPV4

CNAME *.example.com is an ilias of example.com
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I don't see any problems with adding SPF and DKIM entries for subdomain. If all your mails to trough Sendgrid will come from user@delivery.example.com, that's ok, because SFP and DKIM entries would be applied only for subdomain, not for main domain example.com. For example udemy.com use different SPF entries for udemy.com and email.udemy.com.

  • thanks, I think I should remove CNAME *.example.com as an alias fo example.com correct me if I'm wrong. I also have on last question, do I need to create no-reply@delivery.example.com email even though it's only used for outgoing mails? – Raftel May 22 '17 at 3:24
  • @Raftel I think you don't need e-mail no-reply@delivery.example.com, it's no-reply, and all your MX for delivery.example.com will point on Sendgrid. Also about CNAME, you should configure it to sendgrid, at it mentioned in documentation: sendgrid.com/docs/Glossary/cname.html – Alexander Tolkachev May 22 '17 at 7:10

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