XenForo Errors when trying to send email via SMTP using Brevo (formerly Sendinblue)

[Peretz]

Since around the time we upgraded our forums from 2.3.3 to 2.3.4, sending email via SMTP using Brevo (formerly Sendinblue) stopped working. I investigated the issue today, updated the settings with the new Brevo domain name and values, and get the following error when "Use SSL/TLS" is checked in the XenForo Email Options control panel:

Email to REDACTED from REDACTED failed: Connection could not be established with host "ssl://smtp-relay.brevo.com:587": stream_socket_client(): SSL...
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