SMTP connect() failed

Hi dears,
Since a few time, don't know how much, I get this error when requesting password ou ID.
If I switch configuration to PHPMailer the message is sent, but I need to use SMTP for other reasons.
My smtp server is Elasticemail.com using SSL/TLS port 465.
If I try those parameters with Thunderbird it work.
If I just send a test from Joomla configuration page, it work.

So I guess the problem comme from Community Builder, but don't understand where, no mail configuration inside CB.

Any idea to help me ?
Thank's a lot

The SMTP connection from Joomla failed. The link provided in the error gives you several solutions to try. See the below configuration example for GMail SMTP.

SMTP Host: smtp.gmail.com
SMTP Port: 465
SMTP Security: SSL/TLS
SMTP Authentication: Yes
SMTP Username: (your gmail username)
SMTP Password: (your gmail password)

Note you can also use the below.

SMTP Port: 587
SMTP Security: STARTTLS

Sometimes you need to append the port to the host like the following.

SMTP Host: smtp.gmail.com:465

Thank's for your answer.
I read the page error, but nothing is speaking to me for that problem.
If the Joomla email configuration was wrong, "send a test message" would not work, isn't it ?
Acymailing work perfectly (an send a test), so DNS configuration of hosting provider is working, isn't it ?
I tried 587 STARTTLS, doesn't work more, nore smtp.elasticemail.com:465

Only a request to the identifier ou password doesn't work, so I guess the problem is only in CB.

I have Joomla 3.9.10 and CB 2.4.2. I read somewhere in the forum someone has the same problem, since CB 2.2. But he speak about none secure smtp config. That's why I tried SSL instead of not secured 25, but it is the same.
Regards

CB will not fallback to PHPMailer like Joomla. For CB if SMTP fails it throws the error and stops there. Joomla will fallback. You do not use the above settings; those are example using GMail SMTP. I can not help you with your specific SMTP settings. What settings you need should be provided by your SMTP server. As noted above you can also try appending the port to the host as sometimes that's necessary.

I tried
SMTP Host: smtp.elasticemail.com also tried smtp.elasticemail.com:465
SMTP Port: 465 also tried 587 and STARTTLS
SMTP Security: SSL/TLS
SMTP Authentication: Yes
SMTP Username: (elasticemail username)
SMTP Password: (elasticemail password)

When I use PHP Mailer I received the mail with "via mail-out.cluster023.hosting.ovh.net " in the from field.

Try the SMTP usage shown in their below documentation.

elasticemail.com/api-documentation/integration-libraries/integrate-acymailing-with-elastic-email

Beyond that it looks like they may require a Joomla extension for sending emails, which isn't going to work with CB and is found below.

elasticemail.com/integrations/elastic-email-sender-joomla