Yes. Koszmail.pl is a known disposable email service, so block it at signup. Mailboxes expire within minutes and any existing Koszmail.pl account should be treated as a fraud signal.
Every check returns one of three clear outcomes so you know exactly what to do with the address.
The mailbox exists and accepts mail. Send with confidence, the address is deliverable.
The mailbox does not exist, is disposable, or will hard-bounce. Remove it to protect your sender reputation.
The server is catch-all or greylisting, so existence cannot be confirmed. Send selectively and watch engagement.
koszmail.pl publishes 1 MX record. The primary mail exchanger is mx9.aftermarket.hosting, hosted by aftermarket.hosting, and it is currently reachable and answering SMTP. Mail is routed through these servers in priority order, lowest number first.
| Priority | Hostname | IP | Status |
|---|---|---|---|
| 10 | mx9.aftermarket.hosting | 185.253.215.19 | Reachable |
220 web9.47.pl ESMTP Exim 4.99.3 Sat, 30 May 2026 03:14:50 +0200No. koszmail.pl is a disposable email service. Its mailboxes are throwaway and expire within minutes, so addresses on this domain are not safe to accept or send to. Block it at signup and treat existing koszmail.pl accounts as a fraud signal.
Addresses on Koszmail.pl are throwaway inboxes that expire within minutes. Accepting them inflates your user count, wastes onboarding spend, and damages sender reputation when the mailboxes bounce.
Each address runs through 30+ checks including SMTP existence, catch-all detection, role-account filtering, and disposable matching. The same engine has verified billions of addresses since 2012.
Every unverified address is a gamble. Here is what happens when you skip verification and mail a list that has not been cleaned.
Disposable signups skew your activation rate, growth metrics, and analytics with users who never come back.
Welcome series and drip campaigns all fire at a koszmail.pl inbox that has already been discarded.
Throwaway addresses are the standard tool for free-trial farming, multi-accounting, and bot signups.
Mail to expired koszmail.pl inboxes bounces, and bounce rate is one of the first signals mailbox providers punish.
Koszmail.pl is disposable email, registered through Aftermarket.pl Limited.
Koszmail.pl is disposable email, classified as disposable email running on aftermarket.hosting. It operates 1 mail server and currently accepts SMTP connections.
Because koszmail.pl is disposable, every address should be blocked at signup. Mailboxes expire within minutes, so any existing koszmail.pl account in your database is a strong fraud signal worth removing.
Upload a CSV or TXT list of Koszmail.pl addresses to the bulk email verifier. Every address runs through a live SMTP handshake plus catch-all, role-account and disposable detection, and you download a clean list when processing completes. For real-time checks at signup, use the real-time email verification API.
CSV or TXT with one email per line. No formatting needed.
Each Koszmail.pl address is checked with a live server handshake.
Get a verified list with status codes, risk flags, and catch-all detection.
Pay as you go. No subscriptions, and credits never expire.
Everything about verifying email at this domain.
While koszmail.pl functions as an email domain, it is classified as a disposable or temporary email service. Emails sent to koszmail.pl addresses are short-lived and should not be trusted.
Yes, koszmail.pl is a known disposable email provider. Addresses on this domain are temporary and should be blocked in registration forms to prevent fake signups.
koszmail.pl operates its own temporary mail infrastructure designed for disposable email addresses. Check the MX records section for details.
No, you should not send marketing emails to koszmail.pl addresses. Disposable addresses are temporary and will stop functioning. Sending to these domains wastes resources.
While koszmail.pl addresses may pass SMTP verification, they should be flagged and rejected. Use BulkEmailChecker disposable domain detection to block koszmail.pl automatically.
Upload a CSV or TXT list to the bulk email verifier. Every address runs through 30+ checks including SMTP existence, catch-all detection, role-account, and disposable matching. Processing time depends on list size.
99.7% accurate using a direct SMTP handshake with koszmail.pl's mail servers, the same engine that has verified billions of addresses since 2012.
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