Email Security Specialist for Spoofing Issue

Hello,

I am looking for an experienced email security specialist to help investigate and resolve an email spoofing issue affecting our company domain.
We are currently facing a situation where emails appear to originate from Google and reference our website (swissmailbox.com), but are actually being sent from a different email address (mail at swissmail.cc), which also seems to be hosted on Google infrastructure. This raises concerns around spoofing, domain abuse, and potential misconfiguration or misuse of email authentication mechanisms.

Scope of work includes:
Analysis of suspicious emails and headers
Investigation of possible spoofing or domain impersonation
Review of SPF, DKIM, DMARC, and related DNS/email security settings
Identification of the root cause
Recommendations and implementation guidance to prevent recurrence
Requirements:
Proven experience in email security and anti-spoofing
Strong understanding of SPF, DKIM, DMARC, and Google email infrastructure
Ability to clearly explain findings and recommended actions

Please include in your proposal:
-Confirmation that you have handled similar cases
-An estimated timeframe to complete the analysis
-Your terms and pricing for this type of engagement
-Sample emails can be provided if needed.

Thank you, and I look forward to working with a qualified expert.