What are the potential reasons for emails not being delivered when using PHPBB's email function?

Emails sent using PHPBB's email function may not be delivered due to misconfigured SMTP settings, being flagged as spam by the recipient's email provider, or the email server blocking the outgoing messages. To solve this issue, ensure that the SMTP settings are correctly configured, check the spam folder of the recipient's email account, and verify that the email server is not blocking the outgoing messages. 

// Example of setting SMTP settings in PHPBB
$config['smtp_host'] = 'mail.example.com';
$config['smtp_port'] = 587;
$config['smtp_user'] = 'username@example.com';
$config['smtp_pass'] = 'password';
$config['smtp_ssl'] = 'tls';

Keywords

PHPBB email function SMTP spam folder bounce-back emails

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