We tried to upgrade from 3.3.0.13 to 3.4.0.3 but got the following error: ```
[17-Oct-2023 05:32:27 UTC] PHP Fatal error: Uncaught Exception: Mailer driver isn’t specified in the application’s config in /home/…/public_html/lib/pkp/classes/core/PKPContainer.php:315. Our host has tried to upgrade but recognized a code issue, which is beyond the scope of their service. Our site does not use the PHPMailer; instead we employed an SMTP method to use an institutional email account. I have read another posting on this error from June 14 (https://forum.pkp.sfu.ca/t/error-upgrade-ojs-to-3-4/79222) and tried to connect with the author of that posting a couple of days ago but have not heard back yet. Any help would be appreciated. Thank you in advance! @asabhar