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)


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

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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