Hey there,
After reviewing your project description its clear that you want someone expert to check your SMTP server and fix email outgoing issue.
I'm very experienced with System Administration, Network Administration, SMTP Server Configuration and Troubleshooting, SMTP Authentication(SPF, Dkim, Dmarc), SMTP IP Rotation, SMTP IP/Domain Reputation, Email Marketing, Email Handling.
I'll be happy to help you with this.
Thanks in advance for giving the opportunity to working with you.
Have a good day.
Best Regards,
Sirajum Munir.