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trouble with mass emailing being unable to deliver those addresses with an @optonline.net suffix

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As our association's secretary, I have a grouping of over 130 email addresses that I have to correspond with at one time. Of these 130 emails, they have various email suffixes (eg @gmail.com, @hotmail.com, @aol.com, etc). However, when I do a mass emailing, all the @optonline.net emails (12 in all) are returned as: 

MESSAGE NOT DELIVERED. 451 4.7.1 Spam detected. Message contains objectionable content 6204D1F805820BF1

Is there a reason why this particular email suffix is being kicked back? I use a gmail account to send out the mass emailings and I am using Mozilla Firefox for Acer (acer-002 - 2.0)

As our association's secretary, I have a grouping of over 130 email addresses that I have to correspond with at one time. Of these 130 emails, they have various email suffixes (eg @gmail.com, @hotmail.com, @aol.com, etc). However, when I do a mass emailing, all the @optonline.net emails (12 in all) are returned as: ''MESSAGE NOT DELIVERED. 451 4.7.1 Spam detected. Message contains objectionable content 6204D1F805820BF1'' Is there a reason why this particular email suffix is being kicked back? I use a gmail account to send out the mass emailings and I am using Mozilla Firefox for Acer (acer-002 - 2.0)