Message wasn’t delivered because the recipient’s email provider rejected it

  • Resolved swmchau

    (@swmchau)


    4 years, 5 months ago

    I have been using the plugin for over 1 year and it’s has been working great until last week the WordPress server was upgraded. I was told that the new server uses DKIM and SPF to check if the server is allowed to sent email on behalf of other domains. Since then, emails sent using WP Mail SMTP have been rejected by the receiving servers. The error message returned is:

    Remote Server returned ‘550 5.7.501 Access denied, spam abuse detected. For more information please go to https://go.microsoft.com/fwlink/?LinkId=526653’ …
    Authentication-Results: hotmail.com; dkim=none (message not signed) header.d=none;hotmail.com; dmarc=none action=none header.from=eaco.onmicrosoft.com; …

    I am using smtp.office365.com and I have accessed to the O365 admin.
    Any help would be appreciated … thanks

Viewing 4 replies - 1 through 4 (of 4 total)

  • Hi @swmchau,

    Thanks for reaching out. The possible cause of the issue is the sending account has been banned due to detected spam activity. You might need to contact Office 365 support about the issue with that error details. Some part of it indicates there’s no dkim (message not signed) and dmarc setup for the email and that might be the reason the emails are detected as spam.

    I hope this helps!

    Thread Starter swmchau

    (@swmchau)

    Talked with O365 support, they said the only way is to migrate all our emails from our existing domain to O365 domain which would require additional licenses. That would ensure the from and send from values are the same and DKIM signed.

    I think the problem started with our host upgrading the server and turned on DKIM. As outgoing emails from our site are going through WP Mail SMTP to O365 exchange server, they are not signed with our existing domain and therefore the receiving server fails DKIM validation and treats them as spams. Please let me know if you have any suggestion regarding this issue. I would think there are others having the same issue … thanks

    Hi @swmchau,

    Thanks for the details. It is configuration within your Office 365 account causing the issue, you might also want to get in touch with your host for any other options. In case it helps, you can switch to other available mailers. We have documentation on each of the available mailers.

    I hope that helps!

    Hi @swmchau – We haven’t heard from you in about a week, so I’m going to go ahead and mark this ticket resolved. If you still have questions, though, please feel welcome to continue the conversation.

Viewing 4 replies - 1 through 4 (of 4 total)
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