Your software
My Mautic version is: v2.12.1
My PHP version is: 7.4.20
My Database type and version is: MySQL 5.7.34
Your problem
My problem is: Mautic cannot send segment email, 0 out of xxx sent error
These errors are showing in the log:
[2021-06-30 14:09:55] mautic.WARNING: IP LOOKUP: The file “/home/public_html/app/cache/prod/…/ip_data/GeoLite2-City.mmdb” does not exist or is not readable. ]
Try going to the mautic/app/config folder. Edit local.php file and fix the “/…/” in every folder you find there.
And make sure the folder permissions are ok.