I have setup modoboa server in AWS lightsail instance from this link [https://www.linuxbabe.com/mail-server/email-server-ubuntu-18-04-modoboa]
Internal emails are working ( username@domain.net to username2@domain.net )but an email from an external provider like google, yahoo is not working.
Already set up with A, MX ( Google, MailServer ), TXT (spf and _dmarc) Records but still emails from external providers are not working.
Please help