Multiple email bounce back

Question

In the past few days I am getting multiple bounce back on emails I am sending with this error - Remote server returned '554 5.7.0 < #5.7.520 smtp;550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)>'

I'm sending to two separate groups with a maximum of 60 members in total.

Answer 1

Hello,

Email services these days are very strict about group emails coming from personal accounts. Sending an email to 60 recipients can be seen as spam, especially if your account is not a business domain address but a personal account.

Unfortunately, no one knows the magic number to pass spam. It works like a credit score, the number for each user is different, depending on your usage credibility and account history. I've seen in the forum where some were able to send 20 while another couldn't. It also depends on the content in your email, such as sharing excessive links, or some spam languaging, etc.

I would suggest that you break down into more batches and see if that helps.

Further more, Can you use the instruction here, change the email to plain text or rich text format (basically avoid the html format) and see if it goes through:

https://support.microsoft.com/office/change-the-message-format-to-html-rich-text-format-or-plain-text-in-outlook-338a389d-11da-47fe-b693-cf41f792fefa