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Hello,
I have been using this plugin for a long time without any issues. However since 2 days ago I am getting a warning message that the “Last email could not be sent”. I thought it might be a conflict with some other plugins that I used such as Cleantalk or Wordfence, but deactivating them did not solve the issue. Sometimes if I clear the cache, the error goes away and I am able to send a test email successfully. But not always. The error that is shown in the Event Log is “An error occurred when trying to get Gmail aliases: cURL error 7: Failed to connect to gmail.googleapis.com port 443: Connection refused (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)”
This error alternates with the following one “Mailer: Gmail cURL error 7: Failed to connect to gmail.googleapis.com port 443: Connection refused (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)”
How to resolve this? Thank You.