keyword

550 5.2 1

Monthly search volume and cost-per-click data for "550 5.2 1" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=550+5.2+1&country=us" +--------------+------------------+ | volume | 40 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-20 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
smtp 550	140	$0	3/20
550 smtp	140	$0	2/20
5.2 1	110	$0	2/20
550 5.1 1 recipient rejected	70	$0.34	2/20
550 invalid recipient	70	$0	2/20
the email account that you tried to reach is disabled	50	$0	2/20
550 code	40	$0	3/20
550 requested action not taken mailbox unavailable	40	$0	2/20
550 requested action not taken: mailbox unavailable	40	$0	2/20
smtp 550 5.7 1	40	$0	2/20

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=550+5.2+1&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt