keyword

550 550 invalid recipient

Monthly search volume and cost-per-click data for "550 550 invalid recipient" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=550+550+invalid+recipient&country=us" +--------------+------------------+ | volume | 70 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-29 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
550 blocked	210	$0	7/20
550 invalid recipient	70	$0	15/20
550 blocked email	70	$0	10/20
550 email blocked	70	$0	9/20
email 550 blocked	70	$0	9/20
what does 550 blocked mean	50	$0	8/20
the response from the remote server was 550 blocked	40	$0	8/20
the response from the remote server was: 550 blocked	40	$0	7/20
smtp code 550	30	$0	8/20
status code 550	30	$0	7/20

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://api.seodata.dev/v1/keyword?q=550+550+invalid+recipient&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