Can you please indicate which version you’re using (e.g. 3.3.0-13)? Please indicate this in your posts as it assists with troubleshooting.
As a starting point, you may want to have a look at our email troubleshooting advice and try some of the options offered there: https://docs.pkp.sfu.ca/admin-guide/en/email#troubleshooting-email-problems
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