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Iam frequently receiving 'Message delivery failure messages

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This doesn't happen every time i send emails ,it seems to happen to certain recipients in small groups. The details are-Reporting-MTA: dns; iprslrsmtp2msp.cpwnetworks.com and

                           Reporting-MTA: dns; iprslrsmtp2msp.cpwnetworks.com

Final-Recipient: rfc822;cbae@btinternet.com Action: failed Status: 5.0.0 (permanent failure) Remote-MTA: dns; [65.20.0.49] Diagnostic-Code: smtp; 5.4.7 - Delivery expired (message too old) [Default] 421-'Too many messages (1.5.6.1) from 62.24.128.202' (delivery attempts: 76) I am worried that somebody has hacked my emails ,I am not very computer literate so help would be appreciated. Thanks

This doesn't happen every time i send emails ,it seems to happen to certain recipients in small groups. The details are-Reporting-MTA: dns; iprslrsmtp2msp.cpwnetworks.com and Reporting-MTA: dns; iprslrsmtp2msp.cpwnetworks.com Final-Recipient: rfc822;cbae@btinternet.com Action: failed Status: 5.0.0 (permanent failure) Remote-MTA: dns; [65.20.0.49] Diagnostic-Code: smtp; 5.4.7 - Delivery expired (message too old) [Default] 421-'Too many messages (1.5.6.1) from 62.24.128.202' (delivery attempts: 76) I am worried that somebody has hacked my emails ,I am not very computer literate so help would be appreciated. Thanks

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This looks like a message from your email provider's SMTP server. Basically it's saying that the message has not been delivered to the recipients email provider SMTP server. This has got nothing to do with Thunderbird. You should contact your email provider.