It appears you are attempting to send your mail with TLS and your local certificate is not valid (DH KEY TOO SMALL).

I usually recommend getting a REAL SSL certificate (vs. self-signed) if you're going to be using SSL/TLS security on your systems permanently. Its not THAT expensive (see Godaddy.com or most other registrars for deals).

Dan McAllister
IT4SOHO

On 7/21/2015 4:58 PM, Linux wrote:
Hello friends, I have QmailToaster + centos 5.9 and sending emails I've been getting some failure notice:


--------------------------------------------------------------
mailer-dae...@dominio.com <mailto:mailer-dae...@dominio.com>"
<mailer-dae...@dominio.com <mailto:mailer-dae...@dominio.com>> escribió:

Hi. This is the qmail-send program at dominio.com <http://dominio.com>
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<jos...@otherdomain.com <mailto:jos...@otherdomain.com>>:
TLS connect failed: error:14082174:SSL
routines:SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small; connected to 191.8.4.132.
I'm not going to try again; this message has been in the queue too long.
-------------------------------


anyone knows of that is?

Best regards,

Paul


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