Rediffmail email checker: does this rediffmail.com mailbox exist?
In short: Asks Rediff's own mail server whether a rediffmail.com mailbox exists, without sending anything, after syntax, domain, disposable and role checks. Limit: A valid result shows Rediff accepted the mailbox today, not that anyone reads it.
To check if a Rediffmail address exists, enter it here. The checker asks Rediff's mail server about the rediffmail.com mailbox at RCPT TO, then disconnects before any message is sent. Rediff rejected made-up addresses with 550 Requested action not taken: mailbox unavailable on 12 October and 8 November 2026, so a missing mailbox comes back invalid.
Price: this tool is free. Checking a whole email list is from $9/mo, and the first 100 checks are free with Google, no card. Check your list free nowSee pricing
Tuned for rediffmail.com. Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
What can a check confirm at Rediffmail, and what did we measure there? Can you verify a Rediffmail address?
Sample result
[email protected] doesn't exist: Rediff's server rejected it.
- [email protected]
- Reason
- Mailbox not found
- Mailbox check
- SMTP, nothing sent
What this means for you
Invalid means remove it; a real mailbox would come back valid.
- Asks Rediff's server at RCPT TO
- Catch-all test with a random address first
- Catches typo domains with no mail server
- Flags disposable and role addresses
- Rediffmail
- rediffmail.com
- Rediff
By SimpleVerifier Team · Last updated
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How do I check a whole list of Rediffmail addresses?
- Export the list as a CSV or copy the email column; Rediffmail rows and every other domain can go in together.
- Upload or paste it at /verify. The first 100 email checks are free with a Google sign-in, no card.
- For every list after that, Pro includes unlimited email verification. Fair use: the first 100,000 checks a month at full speed, then slower, never cut off.
How do I check a Rediffmail email address?
- Type or paste one address, such as
[email protected]. - Press Check. The tool checks the syntax and domain, asks Rediff's server about a random address that can't exist, then about yours, and disconnects before anything is sent.
- Read the verdict: valid means Rediff accepted the mailbox and rejected the made-up one, invalid means it said the mailbox is unavailable, risky means the check didn't get a clear answer.
- If it comes back risky, check again later: with Rediffmail that is usually a cut-short check, not a bad address.
Example
- You enter
- One address:
[email protected]. - You get
- Valid when Rediff accepts the mailbox after rejecting a random address; invalid ("Mailbox not found") when it answers
550 Requested action not taken: mailbox unavailable; risky only when the check gets no clear answer. - Limits
- Five checks a minute per IP address, one address at a time, no account needed.
How do I check if a Rediffmail address exists without emailing it?
Ask Rediff's mail server instead of the mailbox. On 8 November 2026 rediffmail.com published one MX host, mx.rediffmail.rediff.akadns.net. On 12 October 2026 it answered a made-up address at RCPT TO with 550 Requested action not taken: mailbox unavailable, and a fresh made-up address got the same rejection through this checker on 8 November.
"Mailbox unavailable" is the generic wording RFC 5321 gives for a 550 reply, so the code, not the text, carries the verdict: a permanent rejection at RCPT TO. It comes back invalid ("Mailbox not found"), and an acceptance valid. The Rediffmail provider page has the full DNS snapshot.
Are deleted Rediffmail accounts gone for good?
Rediff's terms say users delete accounts through Rediff's Grievance Officer, that deletion completes within 30 business days, and that personal data and content are deleted or anonymised within 90 days of deletion or deactivation. A Rediffmail address that starts bouncing as unknown should be treated as gone, not paused.
The terms give no inactivity period, so older Indian consumer lists with rediffmail.com addresses are worth checking before each campaign rather than trusting an old result.
Can I check a whole list of Indian addresses?
Yes. Sign in and use the bulk verifier for a CSV or a pasted list; Rediffmail rows get the same mailbox check as here, alongside Gmail, Outlook and everything else.
For a single Gmail address, the Gmail address checker works the same way. The email checker handles any other domain.
What can this checker confirm at Rediffmail?
Each row is something the check runs on a Rediffmail address, and the result you can get from it.
| Check | Can we confirm it? | Result when it fails |
|---|---|---|
| Syntax (the address is written correctly) | Yes | Invalid |
| Domain and mail server (MX) | Yes | Invalid, with a typo suggestion where one fits |
| Disposable or role address | Yes | Invalid (disposable) or risky (role) |
| The mailbox exists | Yes: Rediffmail answers at RCPT TO (550 mailbox unavailable) | Invalid, "Mailbox not found" |
| A temporary reply or timeout | No answer to read | Risky, worth checking again later |
| Someone reads the inbox | No checker can | Use opens, replies or a small first send |
Our checking server offered a made-up address and disconnected without sending, on 12 or 13 October 2026 and again through this checker on 8 November 2026.
Who uses this tool, and for what?
- Teams selling into India
- Confirm rediffmail.com contacts before importing an older consumer list.
- Recruiters
- Check a candidate's rediffmail.com address before an offer or interview email bounces.
- Support teams
- Catch a mistyped address, or a typo domain like rediffmail.con, before you reply.
What can’t this tool tell you?
- A valid result shows Rediff accepted the mailbox today, not that anyone reads it.
- A temporary reply or a refused connection comes back risky, not invalid.
- Rediff doesn't publish how its servers answer mailbox checks; the handling here is from our own checks, which can change.
- One address at a time, five a minute.
Common questions
- How do I check if a rediffmail.com email address is valid?
- Enter it here. The checker confirms the syntax and mail server, then asks Rediff's server about the mailbox without sending. Rediff rejects addresses that don't exist, so a missing mailbox comes back invalid.
- What does 550 mailbox unavailable mean from Rediffmail?
- It is a permanent rejection at RCPT TO, in the generic wording RFC 5321 gives for a 550 reply. For our made-up test address it meant there was no such mailbox. Treat it as a hard bounce.
- Does Rediffmail delete inactive accounts?
- Rediff's terms don't give an inactivity period. They say a deleted or deactivated account's data and content are deleted or anonymised within 90 days.
- Why did my Rediffmail address come back risky?
- Rediff answers mailbox checks, so risky usually means the check was cut short by a temporary reply or a refused connection. Check again later before you drop the address.
- Is this checker free?
- Yes, five checks a minute with no account. For a whole list, sign in with Google for 100 free email checks, no card, or use a monthly plan.
Sources
That was one address. Most people have a list.
The free checker does five addresses a minute, one at a time — fine for spot-checking, useless for a CSV of 40,000.
- Upload a CSV up to 100,000 rows
- Valid, risky and invalid exported as separate files
- Repeat checks free for 14 days, no new connections
Plans from $9 a month, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.