Scrape Company Contact Details

I need a reliable script that can visit company websites and pull every publicly available contact detail—specifically email addresses, phone numbers, and any other relevant information you can capture. The workflow I have in mind is straightforward:

• Either work from a domain list I supply or help me generate one that fits agreed-upon criteria.
• Crawl each site, respecting robots.txt, and extract the required fields.
• Clean the data for duplicates or obvious errors.
• Deliver both the compiled results (CSV or Excel) and the fully documented source code so I can rerun or adapt it later. Python with BeautifulSoup, Scrapy, or Selenium is preferred, but I’m open to alternatives if they achieve the same accuracy and speed.

Please ensure the scraper can handle basic anti-bot measures (delays, rotating headers, etc.) and include a short README so I can get everything running quickly on my end.