There are 2 typical cases of failed email delivery:
1) When emails with Activation code or Password reminder or any other useful or required information going to SPAM or Junk folder or simply not delivered
2) When mail server is not delivering email due to the problem "Relay access denied" in logs
1) There are 2 options to improve email delivery
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A service to validate the SPF record for a domain name: https://mxtoolbox.com/spf.aspx |
2) If you see Relay Access Denied in maillogs and there are no emails delivered make sure to whitelist 127.0.0.1 in mailserver settings at Plesk
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