Hi, Try
yum downgrade openssl-devel openssl You might need to downgrade a second time which will allow this issue to solve Regards nic From: distribucionli...@gmail.com Date: Tue, 21 Jul 2015 17:58:17 -0300 To: qmailtoaster-list@qmailtoaster.com Subject: [qmailtoaster] error sending : SSL3_CHECK_CERT_AND_ALGORITHM:dh key too small Hello friends, I have QmailToaster + centos 5.9 and sending emails I've been getting some failure notice: --------------------------------------------------------------mailer-dae...@dominio.com" <mailer-dae...@dominio.com> escribió: Hi. This is the qmail-send program at 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>: 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