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We're looking for an expert on mail servers and DNS to help us fix an issue where some of our mail is being flagged as spam. We're seeing the message "yourdomain.com does not designate permitted sender hosts" in the mail headers when these emails arrive at places like gmail accounts.
This particularly applies to mail we generate using the PHP mail() function on our server. We use CentOS with Sendmail and our zone file is currently hosted by Cloudflare (previously at GoDaddy). We have SPF records but need them set up correctly.
We won't be able to give server access but a skilled sysadmin should be able to identify the issue by looking at mail headers and DNS records.
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