How to use Email Service Providers for Cold Email Marketing?

So, I have 2k dead accurate email list web scrapped as a start. They are LinkedIn B2B contacts who explicitly told like "feel free to contact me at xxxxx@xxxx.xx". I have chosen an ESP also.

Question:

1. What sender email I should use? I understand that if I were to use my own SMTP, I would use a throwaway domain. But should I use my main business email in ESP, or throwaway domain email there also? As far as I read, IP address of the ESP has the sender score, not your sender email address. You can use any sender email address? Or leave it as it is and let it appear as "send via xxxxx".

2. In the email body, should I use business domain name, or valid URL shortener?

What are the best practices. Thanks in advance.

submitted by /u/Apple1284
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source https://www.reddit.com/r/Emailmarketing/comments/htzurt/how_to_use_email_service_providers_for_cold_email/