No. Many email servers will bounce mail if it does not have proper SPF, etc setup. Especially if the mail appears to have multiple recipients. BCC exists for a reason as does Mass mailout services. It's not the year 2001 anymore.
| SPF: | NEUTRAL with IP ***.85.220.41 |
|---|---|
| DKIM: | 'PASS' with domain c***-org.2****112.g****smtp.com |
And some email servers will even promptly drop an email if no "To", if "To" matches "From" and there are "BCC". I've seen one where more than one BCC on an email will just dump the email.
mxtoolbox does not show the whole story. It only shows the public listings. We got to discussing this yesterday, and another angle is if the destination has you "tagged" as high risk for spamming them, and in some instances, they don't want you figuring out how to bypass their spam listing so they remove it so you can't use their public reporting to "See" if your new spam technique is working.
This can happen if an Office 365 or Gmail user marks the email as spam. This is noted inside the system and marks all mail moving through them with more suspect. Get enough people marking the item as spam and you get bounced no matter what you do. It's why Constant Contact and Mailchimp are so valuable as services. They are recognized as such by Microsoft and Google and are given more latitude in exchange for the fact that they have required unsubscribe links in the mail. And if you mark such an email as spam it can generate a bounce that will trigger an auto unsubscribe. Microsoft and Google usually do not bounce spam messages but they do for known mail services to aid in this function.
Have you logged into the DNS provider to actually look at the entry? You can publish a SPF record that doesn't work the way it should. And does the IP return the proper MX server? What about DMARC?
Pcpete contacted me via PM and told me the fqdn. It doesn’t have SPF, DKIM, or Dmarc. It does have Google Workspaces generic DKIM signature which I didn’t know was a thing until now. But that should moderately improve the email reputation.
I've had a couple of customers over the years doing mass mailing on their own so I've dealt with this as well. Content and sentence construction do play a part. But that doesn't change SPF, DKIM, and DMARC. If it was my customer there would be no discussion. All three are required as we all know the email system will just continue to tighten things up. Even though it's Google Business they should not rely on that as a sole solution. Why? Simple. When processing the troubleshooting tree those three will be check boxes that need to be cleared before an L2 or L3 will do anything more advanced.
