Thank you Brent, >> I found if I have Avast running with mail shield enabled I get this error in >> the Stunnel log window: >> SSL_connect: 140770FC: error:140770FC:SSL >>routines:SSL23_GET_SERVER_HELLO:unknown protocol >> Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket. >> >> This results in no emails being abled to be sent by SMPT. >> >> If I disable Avast's mail shield the mail is sent with no errors. >> Is there a work around for to be able to use Stunnel without disabling >>Avast's mail shield?
>> POP3 Connection >> CERT: Pre-verification error: self signed certificate in certificate chain >> Rejected by CERT at depth=1: OU=generated by Avast Antivirus for SSL/TLS >>scanning, O=Avast Web/Mail Shield, CN=Avast Web/Mail Shield Root >> SSL_connect: 14090086: error:14090086:SSL >>routines:ssl3_get_server_certificate:certificate verify failed If you need avast, sign your stunnel leaf with a well known root CA, and exchange certificates accordingly. cox_mail : avast_dpi : stunnel_TLS_proxy : client https://support.postbox-inc.com/hc/en-us/articles/204602300-Invalid-Security-Certificate-Error-when-using-AVASThttps://support.avast.com/en-eu/article/Troubleshoot-invalid-email-certificate
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