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I took a look at the email that you have contacted us over Erika and I see that the email is indeed in the bounce list.
This is the reason reported from your email server:
smtp; 550 Rejected by header based manually Blocked Senders: firstname.lastname@example.org - http://kb.mimecast.com/Mimecast_Knowledge_Base/Administration_Console/Monitoring/Mimecast_SMTP_Error_Codes#550
Based on the above, it seems that you have manually blocked email@example.com at some occasion, which is why it is rejecting our emails.
Please do check your account and make sure that firstname.lastname@example.org is whitelisted and you should be getting emails.
Do let us know how it goes.