How to Look Up the Mail Provider and Settings for Every Address on a List
To look up the mail provider of every address on an email list, read the MX and TXT records of the domain after the @ in each address in DNS and match them to a known provider. The bulk email domain mail settings lookup does this for every address in a pasted list or CSV, shows the provider's published SMTP and IMAP settings and gives each address a row.
The check reads the domain, not the mailbox.
Why check this on an email list
The provider named on each row is a segment, and a No mail row is a domain you can remove before sending. A list of thousands of addresses has far fewer unique domains, so one lookup per domain is cheap.
The by-hand way
- Take the domain after the @, for example
acme.examplefromsam@acme.example. - Query its MX records, for example
dig MX acme.example. - Match the MX host name to a provider, and look up that provider's published SMTP and IMAP settings.
- Repeat for every unique domain.
To read just the provider, see find which provider is behind an MX record.
Step 1: paste the addresses
Paste addresses one per line, or upload a CSV. Only the unique domains are sent, never the mailbox names.
Step 2: run the check
Press Look up mail settings. The DNS queries are made from our server. Nothing is sent to the domains, and no mail is sent.
Step 3: read the result
| Result | What it means |
|---|---|
| A provider's name | The provider was found; its SMTP and IMAP settings are in the CSV |
| Published by the domain | The domain publishes its own SRV records |
| Not found | Mail records exist but the provider isn't in our table |
| No mail | No MX or a null MX, so mail will bounce |
The CSV carries the SMTP and IMAP settings, where they were read from and the MX host beside each email. Only addresses at a No mail domain are left out of the list handed on to the mailbox check.
What this check cannot do
- It checks the domain, not the mailbox.
- DNS only: no mail server is contacted, so the settings are not tested.
- A provider that isn't in our table shows Not found.
- Up to 100 unique domains a run without an account, 500 signed in.
To read Microsoft 365 records in particular, use the bulk email domain Microsoft 365 checker.
Next: the rest of the list
For the addresses that remain, use the verify page: the first 100 checks are free with a Google sign-in, no card.
Try it now
Paste your list into the bulk email domain mail settings lookup at simpleverifier.com.
Common questions
How do I look up the mail provider of every domain on an email list?
Take the domain after the @ in each address and read its MX and TXT records in DNS. A bulk email domain mail settings lookup does that for every address in a pasted list and shows the provider's published settings.
Do mail settings tell me whether the mailbox exists?
No. The tool checks the domain, not the mailbox.
Does it test the mail servers?
No. It sends DNS queries only and shows the provider's published settings.
Why does a row say No mail?
The domain publishes no MX or a null MX, so mail to it will bounce.
Check your list before you send
Real mailbox checks over SMTP, and nothing is sent to the address. Sign in with Google and your first 100 email checks are free, no card. Plans for bigger lists are on the pricing page.