Mailbox provider · mail.com
How to verify a mail.com email address
Can you verify @mail.com addresses?
PartlyPartly. @mail.com often refuses checking servers before the mailbox question.
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The checker does probe @mail.com, but its server screens or defers unfamiliar checking connections. A refusal at that stage is about the connection, not the address, so it comes back risky ("Server refused our check" or "Mailbox check unavailable") and never invalid. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
Server refused our checkMailbox check unavailablemail.com addresses usually come back inconclusive from a mailbox check. On 12 October 2026 the mail.com mail server mx00.mail.com refused our checking server at the greeting stage, citing the connecting server's reverse DNS (PTR) record. A refusal like that says nothing about whether the address exists.
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Live DNS snapshot: mail.com
Checked 6 November 2026, 11:11 UTCRead from DNS at the time shown and refreshed at most once a day. MX says where mail for mail.com goes; SPF and DMARC describe mail sent from it, not whether any one address exists.
- 10
mx00.mail.com - 10
mx01.mail.com
v=spf1 redirect=_spf.mail.comp=quarantine: meets the requirement and enforces it.
v=DMARC1; p=quarantine; rua=mailto:[email protected]Look up any other domain with the MX lookup or the email provider lookup.
mail.com at a glance
| Operated by | 1&1 Mail & Media Inc. (formerly GMX Internet Services Inc.), Philadelphia, Pennsylvania, USASource: mail.com General Terms and Conditions |
|---|---|
| MX hosts | mx00.mail.com, mx01.mail.comObserved 12 October 2026 (dig MX) |
| Answer to a made-up address | Connection refused at the greeting: 554 Nemesis ESMTP Service not available. No SMTP service. Bad DNS PTR resource record.Observed 12 October 2026 (SMTP probe of a made-up recipient, no message sent) |
| Address rule | One service offers more than 100 domains, including mail.com, email.com, usa.com, myself.com and post.comSource: mail.com: free email domains |
| Address rule | One account can send from up to 10 addresses (aliases)Source: mail.com: alias addresses |
| Inactive accounts | Free accounts must be logged into at least once every six months; mail.com may otherwise terminate or suspend the account and erase its contentsSource: mail.com Terms and Conditions, clause 2.4 |
| Inactive accounts | An account deactivated for inactivity under the Terms cannot be reactivatedSource: mail.com help: can my account be reactivated? |
What mail.com's server says about a missing mailbox
mail.com's server replied 554 Nemesis ESMTP Service not available. No SMTP service. Bad DNS PTR resource record.. That refusal happened at the greeting stage, before the checking server could name any recipient, so it is a verdict on the connecting server, not on the address. SimpleVerifier returns these as risky with "Mailbox check unavailable" and never as invalid, because treating a refusal as "mailbox not found" would delete real customers from your list.
Servers screen connections this way to keep spam out: missing reverse DNS, a low sending reputation or a blocklist listing are the usual triggers. The same screen applies to every checking service that connects from a shared or new IP, which is why mail.com results differ between verifiers. SMTP verification false positives explains how much to trust each answer.
WEB.DE's server sent the identical refusal on the same day, and GMX screens connections on reverse DNS too.
mail.com erases free accounts after six months without a login
mail.com's terms require free users to log in at least once every six months, and say it may suspend the account and erase its contents after that. Its help centre says an account deactivated for inactivity cannot be reactivated. A free @mail.com contact who has been quiet for six months may no longer exist.
The same service also issues more than 100 other domains, such as email.com, usa.com and myself.com, and one account can hold up to 10 addresses. Treat those domains alike when cleaning a list. Our checker was refused at connection over reverse DNS, so a bounce check is not available for this provider.
Cleaning mail.com addresses you can't check
Treat inconclusive mail.com results as unknown, not bad. The checks that don't need the mailbox still work: format, typo domains, duplicates and whether the domain can receive mail. The free list health check runs those in the browser.
For the rest, use the address's history. An address that signed up, bought or replied recently is very likely live. For old or bought data at mail.com, send a small batch first and suppress anything that hard-bounces. If the mail.com share of your list is small, it's often simpler to keep those rows out of a high-risk campaign than to guess.
Common questions
- Can you verify @mail.com addresses?
- Partly. @mail.com often refuses checking servers before the mailbox question. The checker does probe @mail.com, but its server screens or defers unfamiliar checking connections. A refusal at that stage is about the connection, not the address, so it comes back risky ("Server refused our check" or "Mailbox check unavailable") and never invalid. It always checks the syntax, the domain's MX records, disposable domains and role addresses such as info@ first.
- Can I check if a mail.com address exists without emailing it?
- Usually not from a checking service. On 12 October 2026 mail.com's server refused our checking connection at the greeting stage, before any mailbox question, so the result is inconclusive rather than valid or invalid.
- What mail servers does mail.com use?
- On 12 October 2026, mail.com published these MX hosts: mx00.mail.com, mx01.mail.com. You can look them up yourself with the free MX lookup tool.
- Should I delete mail.com addresses that come back risky?
- No. For mail.com, risky reflects how the server treats checks, not the address. Remove the ones that fail format, typo-domain and duplicate checks, then send to the rest in a small batch and suppress whatever hard-bounces.
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