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all emails to one contact bounced back for last week. He wants to receive my emails.

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Since last weekend, all emails to one of my friends have bounced back to me. We've been sending emails back and forth for years. I've spoken to him and he wants to continue to receive my emails. So it's not from his side. I sent an email tonight to him from the website of my internet provider and it looks as if it went through. But emails from my computer tonight were bounced back. I hate to use the website. All other contacts are receiving my emails with no problem. Any help would be appreciated. Thanks in advance.

Since last weekend, all emails to one of my friends have bounced back to me. We've been sending emails back and forth for years. I've spoken to him and he wants to continue to receive my emails. So it's not from his side. I sent an email tonight to him from the website of my internet provider and it looks as if it went through. But emails from my computer tonight were bounced back. I hate to use the website. All other contacts are receiving my emails with no problem. Any help would be appreciated. Thanks in advance.

Chosen solution

Two completely different servers. There is no comparison between using webmail and sending through a SMTP server. Your IP or your provider is blacklisted for spam as per the rejection notice. Follow the steps in the link to fix or live with it. No one here can help you.

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What is the message that comes back with the rejected message?

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Reporting-MTA: dns; dsmdc-mail-omta-03 [10.4.20.34] Received-From-MTA: dns; 50-82-148-120.client.mchsi.com [50.82.148.120] Arrival-Date: Mon, 30 Mar 2015 20:20:12 -0500


Final-recipient: rfc822; Action: failed Status: 5.1.1 Diagnostic-Code: smtp; 553 5.3.0 97.64.187.24 Rejected - see http://emailadmin.registeredsite.com Last-attempt-Date: Mon, 30 Mar 2015 20:20:13 -0500

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The link in the return message explains the problem and how to fix it. Thunderbird just delivers you email to your providers server. It has no control over other servers rejecting it.

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the email from my ISP website appears to have gone through. Yet my emails sent through Thunderbird don't . How to explain this?

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Chosen Solution

Two completely different servers. There is no comparison between using webmail and sending through a SMTP server. Your IP or your provider is blacklisted for spam as per the rejection notice. Follow the steps in the link to fix or live with it. No one here can help you.