In cPanel, once a domain reaches the max fail/deff limit, it is temporary blocked from sending outgoing emails to other domains. cPanel stores block in files:
/var/cpanel/email_send_limits/max_deferfail_DOMAIN_NAME.tldTo unblock a domain, simply remove the file from the email_send_limits directory:
rm /var/cpanel/email_send_limits/max_deferfail_DOMAIN_NAME.tldor to remove block for all domains:
rm -f /var/cpanel/email_send_limits/max_deferfail_*
![2023 08 28 12 15 344x194 - node[175421]: pthread_create: Resource temporarily unavailable](https://pcx3.com/wp-content/uploads/2023/08/2023-08-28_12-15-344x194.png "node[175421]: pthread_create: Resource temporarily unavailable")
