Relay Emails and Spam or Junk Marking

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Relay Emails and Spam or Junk Marking

Post by slowrey » Thu Dec 05, 2019 5:23 am

We have recently implemented Mail Enable as our main SMTP server, and we relay emails from several other application servers within our organization, and some don't have domain names or external IP addresses. We have SPF, DMARC, and DKIM set up for our main Mail Enable server, along with SPF and DMARC for key application servers and their virtual hosts. When we send emails from Web Mail or our client SMTP apps (Outlook, Airmail, Apple Mail) they seem to arrive OK to their destination inboxes. Any relayed emails go into spam or junk on several email services. For each of the relay servers (like server1) we have SPF records with basic security:
TXT server1 "v=spf1 mx -all"

along with MX records and A records (all values are substitutes of the real thing)

MX server1 10

A server1

We have the master records for the mail domain, which also is the same domain as the server1 server, plus other SPF for other relay servers and their IP addresses:

MX 10
TXT "v=spf1 mx ip4: ip4: -all"

With everything we have set up, at least one relay server we don't have control of. Looking at the SPF for mailchimp, they only use ip4 addresses in their SPF. Should we switch to that model? Does this even have anything to do with our emails coming up as spam in some of the email services?

For our relay servers, is there a way to have Mail Enable remove their header information from the outbound emails to eliminate some of the confusion to the spam bots? Is there a way to tell quickly what main email services are marking our relayed emails as spam? The spam level is 5, so it is "possible" or "medium" spam level. These are not marketing emails - only sending to our subscribers.
Thanks for any guidance you can give.

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