Email domain
c2i.net email servers, SPF and DMARC
Mail for @c2i.net goes to blackhole.aftermarket.pl (MX priority 10), as DNS showed on 5 November 2026. The host sits under aftermarket.pl. The domain publishes an SPF record ending in -all and a DMARC policy of p=reject, which decide whether mail claiming to be from @c2i.net is trusted.
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c2i.net mail DNS on 5 November 2026
| Priority | MX host | Platform |
|---|---|---|
| 10 | blackhole.aftermarket.pl | Not identified |
| SPF | v=spf1 mx -all |
|---|---|
| DMARC | v=DMARC1; p=reject; adkim=s; aspf=s |
| MTA-STS | None published |
| TLS reporting | None published |
Read on 5 November 2026 with dig against 1.1.1.1 (8.8.8.8 as fallback); nothing sent to the mail servers. Check the records today with the email provider lookup.
c2i.net MX records
c2i.net publishes a single MX host, blackhole.aftermarket.pl. With no backup host, a sender that can't reach it queues the message and retries until the server answers or the queue gives up.
c2i.net SPF record
The record on 5 November 2026 was v=spf1 mx -all.
It ends in a hard fail (-all): receivers may reject mail from any server the record does not list.
c2i.net DMARC policy
The record is v=DMARC1; p=reject; adkim=s; aspf=s.
p=reject asks receivers to refuse mail that fails DMARC.
What that means for you: if a contact gives an @c2i.net address and you send to them, nothing changes. But never put an @c2i.net address in the From line of mail sent through your own tool or ESP. It can't pass DMARC for c2i.net, and this policy tells receivers to refuse it.
Can you verify @c2i.net addresses?
Our checker treats @c2i.net like any domain: syntax, MX, disposable and role checks first, then a made-up address to rule out a catch-all, then your address at RCPT TO, disconnecting without sending. We have not published a test of how blackhole.aftermarket.pl answers for @c2i.net, so we make no claim here about whether single mailboxes can be confirmed; each result carries its own reason.
Cleaning a list with these addresses
DNS tells you where mail goes, not whether one person's mailbox still exists. For a list, run the whole file through a verifier before you send: invalid rows come out, risky rows (catch-all, unknown, refused) go in their own segment, and valid rows are safe to mail.
Common questions
- What are the MX records for c2i.net?
- On 5 November 2026:
blackhole.aftermarket.pl(priority 10). - Does c2i.net have SPF and DMARC?
- On 5 November 2026
c2i.netpublished an SPF record ending in-alland a DMARC policy ofp=reject. - Is c2i.net a disposable email domain?
- No.
c2i.netis not on the disposable domain list our checker uses, so @c2i.net addresses are checked like any other mailbox. See the disposable domain checker for the list.
Free checks for @c2i.net lists
- Bulk email checker for a pasted list or CSV
- Verify a whole file with a reason for every row
- SPF lookup counter
- MTA-STS checker
- Disposable email checker
Another domain? See every email domain we have mapped and what our checker does at each mailbox provider.
Got a list with @c2i.net addresses?
Sign in with Google and the first 100 addresses are checked free: valid, risky and invalid, with the reason for each row and a file to download. No card. After that, plans start at $9/mo for 2,500 emails a month.
By continuing you agree to our Terms and Privacy Policy.