Necesito backend para resolver email de salida, recibo email por Hestia pero no salen, estoy con GCP, configurar EXim, DOVEcot, etc

I need a backend developer with experience in configuring email servers to help me resolve the issue of outgoing emails not sending from my Hestia email server. I am currently using GCP for my project.

Specific Requirements:
- Configure EXim and DOvecot to ensure proper email delivery from my Hestia server
- Troubleshoot and fix any issues that may be causing the emails to not send

Skills and Experience:
- Proficiency in backend development
- Experience with configuring email servers, specifically EXim and DOvecot
- Knowledge of GCP and Hestia email server
- Ability to troubleshoot and resolve technical issues related to email delivery

Note: As I am open to recommendations, the ideal candidate should be able to provide suggestions and advice on any additional features or configurations that may improve the email delivery process.