my emails to hotmail accounts often returned unsent
this is te message i get. This is the mail system at host smtp11.relay.iad3b.emailsrvr.com. I'm sorry to have to inform you that your message could not be delivered
The mail system
..................@hotmail.co.uk>: host
eur.olc.protection.outlook.com[104.47.17.97] said: 550 5.7.1 Unfortunately, messages from [146.20.161.80] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider
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The issue you have is not a Thunderbird problem, so there is nothing within Thunderbird which can fix the problem.
outlook spam filter is blocking receiving of emails because the IP address is on a block list. Often they mention what caused the block eg: spamhaus blacklist. But you have not mentioned that in the info you provided. You may need to try a different IP address.
146.20.161.80 seems to a Rackspace hosting IP address range.
Located RackSpace Information on bounce back emails and what to do.
Located the following, but there are several reponses so you would need to read through, but it seems to involve completing a form to see if they can allow the IP address.
- https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/550-571-unfortunately-messages-from-werent-sent/71763bb5-e345-47db-ade7-c1f5605d7861?page=1
- https://answers.microsoft.com/en-us/outlook_com/forum/all/since-part-of-their-network-is-on-our-block-list/d956ad0e-3019-4440-bbb1-15693d66e438
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