SSL Library Error - SMTP Mails Not Working...

Hi…

I can send emails using Rainloop

But, When I add SMTP Credentials in Web Script, it won’t send.

I tested with the other Two SMTP credentials in the same script, it worked.

So, there is no problem with Script.

I contacted Ruikai on Litespeed,

I shared Centos Mailog with him…

He found there is an SSL Library Error.

And asked me to contact Cyber Panel.

What should I do?

I have the same issue, as as I wanted to test my new site and I believe the issue related to ssl.
I already fixed recent problem with acme not using let’s encrypt by default and changed it to let’s encrypt again. So the ssl now works for domain, but apparently not for mail server.

Jan 30 02:28:27 localhost postfix/smtps/smtpd[1670]: connect from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]]
Jan 30 02:28:27 localhost postfix/smtps/smtpd[1670]: warning: 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 02:28:27 localhost postfix/smtps/smtpd[1670]: disconnect from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]] ehlo=1 auth=0/1 quit=1 commands=2/3
Jan 30 02:28:43 localhost postfix/smtps/smtpd[1670]: connect from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]]
Jan 30 02:29:13 localhost postfix/smtps/smtpd[1670]: SSL_accept error from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]]: -1
Jan 30 02:29:13 localhost postfix/smtps/smtpd[1670]: warning: TLS library problem: error:140760FC:SSL routines:SSL23_GET_CLIENT_HELLO:unknown protocol:s23_srvr.c:640:
Jan 30 02:29:13 localhost postfix/smtps/smtpd[1670]: lost connection after CONNECT from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]]
Jan 30 02:29:13 localhost postfix/smtps/smtpd[1670]: disconnect from 94-237-96-222.de-fra1.upcloud.host[[MY-IP-IS-HIDDEN]] commands=0/0
Jan 30 02:32:24 localhost postfix/smtpd[1714]: connect from unknown[176.111.173.23]
Jan 30 02:32:25 localhost postfix/smtpd[1714]: warning: unknown[176.111.173.23]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 02:32:25 localhost postfix/smtpd[1714]: lost connection after AUTH from unknown[176.111.173.23]
Jan 30 02:32:25 localhost postfix/smtpd[1714]: disconnect from unknown[176.111.173.23] ehlo=1 auth=0/1 commands=1/2
Jan 30 02:33:21 localhost postfix/smtpd[1714]: connect from unknown[141.98.10.143]
Jan 30 02:33:21 localhost postfix/smtpd[1714]: warning: unknown[141.98.10.143]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 02:33:21 localhost postfix/smtpd[1714]: disconnect from unknown[141.98.10.143] ehlo=1 auth=0/1 quit=1 commands=2/3
Jan 30 02:34:59 localhost postfix/smtpd[1714]: connect from unknown[141.98.10.136]
Jan 30 02:34:59 localhost postfix/smtpd[1714]: warning: unknown[141.98.10.136]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 02:34:59 localhost postfix/smtpd[1714]: disconnect from unknown[141.98.10.136] ehlo=1 auth=0/1 quit=1 commands=2/3
Jan 30 02:37:15 localhost postfix/smtpd[1752]: connect from unknown[218.25.161.226]
Jan 30 02:37:15 localhost postfix/smtpd[1752]: warning: unknown[218.25.161.226]: SASL LOGIN authentication failed: Invalid authentication mechanism
Jan 30 02:37:15 localhost postfix/smtpd[1752]: disconnect from unknown[218.25.161.226] ehlo=1 auth=0/1 quit=1 commands=2/3
Jan 30 02:38:27 localhost postfix/anvil[1674]: statistics: max connection rate 1/60s for (smtps:[MY-IP-IS-HIDDEN]) at Jan 30 02:28:27
Jan 30 02:38:27 localhost postfix/anvil[1674]: statistics: max connection count 1 for (smtps:[MY-IP-IS-HIDDEN]) at Jan 30 02:28:27
Jan 30 02:38:27 localhost postfix/anvil[1674]: statistics: max cache size 2 at Jan 30 02:33:21

@sibipaul said:
Hi…

I can send emails using Rainloop

But, When I add SMTP Credentials in Web Script, it won’t send.

I tested with the other Two SMTP credentials in the same script, it worked.

So, there is no problem with Script.

I contacted Ruikai on Litespeed,

I shared Centos Mailog with him…

He found there is an SSL Library Error.

And asked me to contact Cyber Panel.

What should I do?

@nima said:
I have the same issue, as as I wanted to test my new site and I believe the issue related to ssl.
I already fixed recent problem with acme not using let’s encrypt by default and changed it to let’s encrypt again. So the ssl now works for domain, but apparently not for mail server.

You can Update Cyber Panel…

if this problem not fix… the Post it on Cyber Panel facebook group… experts will help you to fix it…

Thanks.

Please read these two guide →

6 - Self-signed SSL error on Outlook/Thunderbird - CyberPanel (This may help you solve your issue on sending email through mail client)