Email Validator
Check email addresses for valid format and deliverability
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How many addresses on your list will bounce the moment you press send? Is that signup a genuine customer or a throwaway inbox created to grab a discount code? Email Validator reads an address, checks its structure and tells you what looks wrong before the send does it for you.
Short answer: Email Validator is a free tool on EizTools that checks email addresses for correct format and likely problems. It flags invalid structure, misspelled provider domains, disposable inbox patterns and role accounts, explaining each verdict as it goes.
What is Email Validator?
Email Validator inspects addresses as text. It checks the local part before the at sign, the domain after it, the characters used and the overall shape, then reports which addresses break the rules and why.
One thing needs saying up front, because most tools with this name work differently. This one does not connect to a mail server, so there is no live check that a mailbox exists. It reasons about the address instead, which catches most list problems: typos, malformed entries, throwaway domains and shared inboxes.
How Does Email Validator Work?
Put one address in the prompt box, or a whole column with each entry on its own row. An engine selector sits above the generate button, with the check settings folded underneath. The report comes back in the output card, ready to copy or download as a Word file when someone else is going to work through the corrections.
Key Features
Structure checked properly
Missing at signs, double dots, illegal characters and absent domains are all reported per address.
Provider typos caught
Near misses of the big mail providers are flagged with the spelling that was probably meant.
Disposable patterns
Addresses matching the shape of throwaway inbox services are called out for review.
Role accounts noted
Shared boxes such as info or sales are identified, since they behave differently in a campaign.
| Option | What it does for this job | Suggested value |
|---|---|---|
| Output Type | How verdicts are presented | Structured, one line per address |
| Include Examples | Whether a likely correction is offered | On, since the corrected address is the point |
| Detail Level | How much reasoning accompanies each verdict | Mid range for a list, higher for individual checks |
| Focus / Audience | The vocabulary of the report | Marketers for list work, Developers for form validation |
The panel here is the site's shared options set rather than one written for address checking, so Tone and Length have little effect. Custom Instructions is the field that matters, and it is where you say things like treat role addresses as acceptable.
Who Should Use It?
Anyone sending to a list they did not build themselves. Marketers cleaning subscribers before a campaign, since bounce rates affect future delivery. Support teams checking an address read out over the phone. Developers deciding what their signup form should reject.
Example Inputs And Outputs
Paste four addresses: one correct, one ending gmial.com, one reading sarah@@example.com and one at a known throwaway domain. Set Output Type to Structured, Include Examples on, Detail Level around the middle.
The report returns a verdict per line. The first passes. The second is flagged as a probable typo with the intended spelling shown. The third fails on structure, with the duplicated at sign named. The fourth is valid but marked disposable, which is information rather than a fault.
Important A valid format is not proof that anyone reads that inbox. Addresses go stale, staff leave and mailboxes fill up. For a list that has been sitting unused for a year, a format check is the first step and a re engagement send is still the real test.
Tips
- ✅ Check the list before the campaign, since bounces damage sender reputation
- ✅ Ask for corrections, not just verdicts, so typo addresses can be recovered
- ✅ Decide your own policy on role and disposable addresses before you start deleting
When a check turns up a customer whose address was wrong on something you already sent, the Apology Email Writer covers the message that has to follow.
EizTools has no sign in, no billing and no restriction on repeat runs, so checking a list in several passes costs nothing but time. Email Validator lets you pick the AI model family for each run, which is useful when a batch is full of unusual company domains and the first pass is unsure about them.
Frequently Asked Questions
Does it confirm the mailbox exists?
No. There is no server connection or delivery test. It assesses the address as written, which catches typos and malformed entries but cannot tell you whether anyone is reading it.
Can it spot disposable email services?
It recognises the patterns those services use and flags addresses that match. Treat it as a strong signal rather than a definitive list, since new providers appear constantly.
Can I check new signups regularly?
Yes, and many teams do it weekly rather than waiting for a campaign to expose the bad entries. Paste the recent signups and ask for structured verdicts.
Should I delete every flagged address?
No. Structural failures are safe to remove. Role accounts and disposable domains are policy decisions, and for some businesses a shared inbox is the correct contact.
An invalid address costs more than one lost message. Bounces tell mail providers your sending is careless, and that decides whether the next campaign arrives at all. Paste your list above, ask for structured verdicts with corrections, and clean it before you send.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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