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I was looking into SendGrid and came upon this interesting forum post saying you don't have to make DNS mods to ensure deliverability: http://community.sendgrid.com/sendgrid/topics/why_dont_i_need_an_spf_record_or_other_dns_mods
Our Free accounts do not require any DNS changes because we set the return path header, SPF, and DomainKeys headers to point to SendGrid's SPF and DomainKeys.
My question is if this approach is reliable and the experience from our clients' side isn't affected. Also, what's stopping anyone from sending emails on behalf of our domain if SendGrid automatically makes them seem reliable?
Thanks, Vilem
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Domain AuthenticationYou will be required to create a subdomain so that SendGrid can generate the DNS records which you must give to your host provider. If you choose to use Automated Security, SendGrid will provide you with 3 CNAME records.
Domain Name System (DNS) translates a domain name into an IP address to find the owner's site. Let's say that you type the URL www.sendgrid.com into your browser. The browser contacts a DNS server to get the IP address. A DNS server would start its search for an IP address by contacting one of the root DNS servers.
Yes, it's possible to authenticate multiple domains. When multiple authenticated domains exist on your account, SendGrid will use the from address for each email you send through SendGrid and match it to a domain and branded link.
A Reverse DNS consists of a subdomain and domain that will be used to generate a reverse DNS record for a given IP address. Once Twilio SendGrid has verified that the appropriate A record for the IP address has been created, the appropriate reverse DNS record for the IP address is generated.
The difference is that on the accounts that don't have a dedicated IP address (including the free account) the SPF and DKIM signatures point back to SendGrid controlled domains rather than client controlled domains. It is definitely reliable and works, but some email clients (notably gmail) will display a "via sendgrid.info" message.
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