Some of my users are receiving NDRs when sending to a particular domain. These NDRs say: The following organization rejected your message: xyz.com They also have a line with the following: X-SpamScore: 1 and sometimes there's an eleven instead of the one.
Does this mean that the receiving email server is considering the message as spam?
Possibly, you would really have to talk to their email admins to find out what criteria they are using to apply a score to a particular message and why they are being rejected. You could also enable SMTP protocol logging to get a SMTP conversation view of message rejections:
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