keyword

550 requested action not taken: mailbox unavailable

Monthly search volume and cost-per-click data for "550 requested action not taken: mailbox unavailable" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=550+requested+action+not+taken:+mailbox+unavailable&country=us" +--------------+------------------+ | volume | 40 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-21 | +--------------+------------------+

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 smtp	140	$0	5/20
smtp 550	140	$0	4/20
550 invalid recipient	70	$0	4/20
550 requested action not taken mailbox unavailable	40	$0	19/20
550 no mailbox by that name is currently available	40	$0	4/20
550 request failed mailbox unavailable	40	$0	4/20
requested action not taken mailbox unavailable	30	$0	9/20
requested action not taken: mailbox unavailable	30	$0	7/20
smtp code 550	30	$0	5/20
mailbox unavailable 550	20	$0	8/20

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+requested+action+not+taken:+mailbox+unavailable&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