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Re:Security 101 for SaaS startups by itaifrenkel on Sunday March 05, 2017 @11:19PM (#13800670)
My understanding was that SPF and DKIM are only for sending emails.

I need to rearrange that paragraph and add the 2 other reasons you mentioned, and you are right that outgoing emails are better sent from subdomains.

I do wonder though if a spam filter blocks x.d.com would it also block emails from d.com?

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