seodata.dev

keyword

what is mail header

Monthly search volume and cost-per-click data for "what is mail header" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=what+is+mail+header&country=us" +--------------+------------------+ | volume | 720 | | cpc | $42.87 | | competition | 0.01 | | country | US | | updated | 2026-05-30 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
email header 2,900 $3.57 18/20
email headers 2,900 $7.63 16/20
what is the header of an email 720 $0 17/20
what is a header in email 720 $42.87 16/20
what is email headers 720 $42.87 16/20
what are email headers 720 $0 15/20
what is an email header 720 $42.87 15/20
what is email header 720 $0 15/20
what is header in email 720 $42.87 15/20
what is the email header 720 $42.87 15/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=what+is+mail+header&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 1,000/month

Full API spec: llms.txt