It sounds like you're seeking ongoing assistance with cold email campaigns from an experienced provider who can manage and optimize campaigns beyond the initial setup. Here are some key points to include in your request:
About Us:

We are a [describe your company briefly], looking to expand our outreach through effective cold email campaigns. We value ongoing support and expertise to maintain and optimize our outreach efforts.
Responsibilities:

    Campaign Management: Develop and execute cold email campaigns to generate leads and opportunities.
    Optimization: Continuously optimize campaigns based on performance metrics and feedback.
    Content Creation: Write compelling email copy that resonates with our target audience.
    A/B Testing: Conduct A/B tests on subject lines, content, and timing to improve open and response rates.
    Compliance: Ensure compliance with email marketing regulations and best practices.

Requirements:

    Proven Experience: Demonstrable success in managing and optimizing cold email campaigns with measurable results.
    Case Studies: Provide case studies or examples showcasing successful campaigns and improvements achieved.
    Availability: Commitment to ongoing support beyond initial setup to maintain and enhance campaign effectiveness.
    Communication Skills: Strong communication skills to collaborate effectively with our team and adjust strategies as needed.

How to Apply:

If you have the expertise and experience to drive successful cold email campaigns and are looking for a long-term partnership, we invite you to apply. Please submit your resume, along with case studies or examples of successful campaigns you've managed.

We look forward to finding a dedicated partner to enhance our outreach efforts through effective cold email marketing.
Example Request for Proposal (RFP):

Dear Prospective Cold Email Specialist,

We are seeking an experienced provider to assist with ongoing cold email campaigns to expand our outreach efforts at [Your Company Name]. Our goal is to maintain and optimize campaigns for sustained success beyond the initial setup stage.

About Us:
[Describe your company briefly, including your industry, target audience, and any relevant information.]

Responsibilities:

    Develop and execute cold email campaigns to generate leads and opportunities.
    Continuously optimize campaigns based on performance metrics and feedback.
    Write compelling email copy that resonates with our target audience.
    Conduct A/B tests on subject lines, content, and timing.
    Ensure compliance with email marketing regulations.

Requirements:

    Proven success in managing and optimizing cold email campaigns.
    Provide case studies or examples showcasing successful campaigns.
    Commitment to ongoing support and campaign management.
    Strong communication skills for effective collaboration.

How to Apply:
If you have the expertise and experience to drive successful cold email campaigns and are interested in a long-term partnership, please submit your resume and relevant case studies or examples of your work.

We look forward to discussing how you can contribute to our outreach goals.

Best regards,

Your Name
This outline should help you attract experienced providers who are capable of managing and optimizing your cold email campaigns effectively over time.