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This topic was posted over a year and marked resolved, but resolution does not help me. I am having this same issue and my server hosting has no clue how to fix. They are asking me how to recreate the problem. Since I do not know what the plugin is doing to create the problem, I have no response for them.
Versions:
WordPress: 5.2.2
WordPress MS: No
PHP: 7.3.6
WP Mail SMTP: 1.5.2
Params:
Mailer: gmail
Constants: No
Client ID/Secret: Yes
Auth Code: Yes
Access Token: Yes
Server:
OpenSSL: OpenSSL 1.1.1b 26 Feb 2019
PHP.allow_url_fopen: Yes
PHP.stream_socket_client(): Yes
PHP.fsockopen(): Yes
PHP.curl_version(): 7.64.0
Debug:
Mailer: Gmail
cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)