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From time to time e-mails are not sent. I then get the following error message. If I then send a test e-mail (which also arrives), it works again until at some point another e-mail is not sent.
EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.6.0 logged this error during the last time it tried to send an email:
Mailer: Sendinblue [0] cURL error 6: Could not resolve host: api.sendinblue.com (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)
Consider running an email test after fixing it.