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Problem with email deliverability to Outlook, Yahoo, Gmail etc

smeko
Hi all, Hope you are well. I administrate a cpanel shared hosting server and accounts which are hosted there have problem with sending emails to Outlook, Gmail, Yahoo etc. First case is: It returns error below: host outlook-com.olc.protection.outlook.com [104.47.70.33] SMTP error from remote mail server after pipelined MAIL FROM:<='test@cp-project.al'>test@domain1.com> SIZE=1619: 550 5.7.1 Unfortunately, messages from [80.78.66.80] 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 to

Comments

3 comments

Date Votes
  • andrew.n
    SIlvi, The error message clearly shows that the IP is blocked at the provider side. You have to reach out to Hotmail to request delisting which could be a hassle sometimes :(
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  • cPRex Jurassic Moderator
    @andrew.n is correct - that error message does indicate that you are blocked by Outlook. While you may not be blocked on a public list that you can check with a tool like Email Blacklist Check - IP Blacklist Check - See if your server is blacklisted or MultiRBL.valli.org - Blacklist, Whitelist and FCrDNS check tool, all the major email providers, like Google and Outlook and Hotmail, all maintain their own internal blacklists. Since the mail is being blocked by Outlook you will need to contact them directly to see what the problem is. If other providers are also blocking the message or filtering your content to the spam folder, you would need to contact them directly as well to see if they can help you fix that.
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  • keat63
    As Outlook, Yahoo and Gmail are all different providers, then your server has done something serious. If it's a shared server, then this could be out of your control. Another account on the server is probably sending spam, so all accounts on the whole server have been blacklisted. If this is the case, then I would suggest reaching out to your server provider/data centre. If you own your own server and it's not shared with anyone, then you'll have to find which account is causing this. here's a link to ask for delisting from MS
    0

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