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Undeliverable messages

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Rebouka
Rebouka
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Hello,

Many of the emails I send (usually to proffessional addresses as contact@dhl.com), come back witht this message :

Delivery has failed to these recipients or groups:

contact (contact@dhl.com) The e-mail system had a problem processing this message. It won't try to deliver this message again.




Diagnostic information for administrators:

Generating server: exchange.dhl.com

When I try to send them from my gmail address directly from internet it works perfectly so the issue come from thunderbird for sure.

Could someone help?

Warm regards

Hello, Many of the emails I send (usually to proffessional addresses as contact@dhl.com), come back witht this message : Delivery has failed to these recipients or groups: contact (contact@dhl.com) The e-mail system had a problem processing this message. It won't try to deliver this message again. Diagnostic information for administrators: Generating server: exchange.dhl.com When I try to send them from my gmail address directly from internet it works perfectly so the issue come from thunderbird for sure. Could someone help? Warm regards

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Matt
Matt
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Usually these issues stem from two sources.

The email address is simply not valid (it contains a space or a comma instead of a dot or whatever.

The second is far more insidious and difficult to deal with. That is the issue of the SMTP server being blacklisted for SPAM or wrong MX in the DNS record etc. The fact that it is an exchange server is itself an issue, because it generates some of the most cryptic error messages.

Note here that the SMTP server provided by your mail provider for you to use is not the same server they use to send web mail. Confused yet?

SO are you normally sending from the gmail SMTP server, or a hosted server or a Google domain etc. More detail needed here to do more than generalize.