Yahoo has been deactivating @ymail.com and @rocketmail.com accounts since 2013. If your list is older than 2 years, up to 1 in 3 ymail addresses may already be gone.
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Ymail.com is a secondary email domain operated by Yahoo. Launched in 2008, it let users register @ymail.com addresses as an alternative to @yahoo.com - useful when their preferred username was already taken on the main domain.
Yahoo also offered @rocketmail.com for the same purpose. Both domains route to the same Yahoo Mail servers and inbox. The three suffixes - @yahoo.com, @ymail.com, and @rocketmail.com - are interchangeable from a delivery standpoint.
Yahoo closed new @ymail.com registrations around 2012-2014. All three domains are now legacy infrastructure - no new sign-ups, existing accounts continue until deactivated.
Yahoo deactivates accounts not logged into for 12+ months, then may recycle the username to a new owner or leave it dormant.
Since 2013, Yahoo has recycled deactivated usernames. A ymail address from your 2019 list may now belong to a completely different person.
Many users typing @yahoo.com accidentally enter @ymail.com - or vice versa. These typos result in hard bounces if the ymail variant does not exist.
Yahoo blocks SMTP probes from IPs with poor sender reputation. BounceZero routes through Hetzner-hosted IPs with separate inbox placement history to get around this.
Yahoo blocks naive SMTP probing. BounceZero routes around Yahoo restrictions with a dedicated verification chain.
Confirms ymail.com / rocketmail.com MX records point to Yahoo infrastructure. Same MX as @yahoo.com - verified against our static provider map.
SMTP probes route through Hetzner Finland IPs with established Yahoo delivery history - not shared OVH ranges. Yahoo returns definitive 550 rejections for dead accounts.
When Yahoo accepts the RCPT TO (possible dormant account), our ML model scores dormancy probability based on username patterns, creation-era signals, and Yahoo recycling history.
If the username was registered before 2013 and the SMTP accepts, we mark the result valid with a recycling warning in the metadata - protecting you from landing in a stranger's inbox.
| Domain | Launched | New signups | Mail servers | Dormancy risk |
|---|---|---|---|---|
| @yahoo.com | 1997 | Active | Yahoo mx*.mail.yahoo.com | Medium |
| @ymail.com | 2008 | Closed ~2014 | Same Yahoo servers | High |
| @rocketmail.com | 2008 | Closed ~2014 | Same Yahoo servers | High |
All three domains use the same Yahoo Mail infrastructure. Verification approach is identical - only the dormancy risk differs due to registration era.
Ymail.com is a secondary email domain operated by Yahoo, launched in 2008. It allowed users to register @ymail.com addresses as an alternative to @yahoo.com. Both domains route to the same Yahoo Mail inbox. New @ymail.com registrations are no longer available - it is a legacy domain for existing accounts only.
The ymail.com domain is still active and Yahoo delivers to @ymail.com addresses. However, Yahoo has deactivated millions of dormant accounts since its 2013 account recycling program. An address on your 2018 list that appeared valid may have been deactivated and potentially reassigned since then.
Yes. Ymail.com is fully Yahoo-operated. @ymail.com addresses use the same servers, authentication, and inbox as @yahoo.com. The only difference is the domain suffix - the mailbox infrastructure is completely identical.
Ymail addresses bounce for several reasons: Yahoo deactivates accounts inactive for 12+ months, the user closed their account, the username was recycled to a new owner, or the address was mistyped (ymail.com instead of yahoo.com). BounceZero detects all of these cases using Yahoo-specific SMTP probing and ML dormancy scoring.
BounceZero connects to Yahoo Mail SMTP servers using IPs with established inbox delivery history, issues a RCPT TO command, and interprets the response code. Yahoo returns definitive accept (250) or reject (550) signals for most mailboxes. For blocked probes, BounceZero falls back to Hetzner-routed verification, achieving definitive results on over 90% of ymail addresses tested.
Upload a CSV of ymail.com and rocketmail.com addresses. BounceZero verifies each one and flags dormant, deactivated, and recycled accounts. 100 free credits, no card required.
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