After successful email verification, a complete report explaining the status of each email will be generated. The generated report will be very transparent and easy to understand. The terminology used in your email verification report is explained below.

Verification Result

Every email is primarily categorized as either Valid, Invalid or Unknown.

  • Valid - After a successful SMTP transaction, if receiving mail server accepts the email address, it will be marked Valid Email Address. Sending emails to the addresses which are marked as "Accept All" or "Disposable" is not recommended, even though the email address is valid.

  • Invalid - An email address will be marked Invalid if it is syntactically incorrect or an email account does not exist on receiving mail server.

  • Unknown - Sometimes receiving mail server responds very slowly or may temporarily be unable to process requests. In this case, the email address will be marked Unknown and email verification won't be counted (This makes QuickEmailVerification different from other service providers). In most cases, such emails can be re-verified after 5 to 10 minutes. The results will show whether the email address is Valid or Invalid.

Results that have been marked Unknown are not deducted from your total credit.

Associated Reasons

Apart from the email verification results mentioned above, the report generated will contain the associated reasons for the given results. The reason string elaborates the email verification results by specifying more detailed reason behind the email result. For example, Invalid Email can be classified further as syntactically 'invalid_email' or as receiving server has 'no_mx_record' or 'rejected_email'. The definition of each reason is explained below.

Invalid_emailThe syntax of the email address is invalid (Is not according to RFC standards).
Invalid_domainThe domain used in an email address doesn't exist.
rejected_emailSMTP server rejected email. Email account doesn't exist on receiving server.
accepted_emailSMTP server accepted email.
no_connectCould not connect to receiving SMTP server.
timeoutSession timeout occurred on the remote SMTP server. It happens when the receiving mail server is responding too slow.
unavailable_smtpReceiving SMTP server was not available to process a request.
unexpected_errorSome unexpected error has occurred on the receiving SMTP server.
no_mx_recordMX record of the domain doesn’t exist.
temporarily_blockedEmail address is temporary greylisted.
exceeded_storageEmail account on receiving server has exceeded storage allocation.


QuickEmailVerification performs advance level filtering on valid email addresses to filter out false positive and risky emails. This process identifies good quality email addresses to achieve the best deliverability and increases your email open rates. These good quality addresses are marked SafeToSend. Using SafeToSend email addresses our customers achieve more than 97% deliverability and many of them achieve nearly 100% deliverability too. SafeToSend email addresses are covered by our email deliverability guarantee. We strongly recommend you use only SafeToSend email addresses while sending emails in bulk.

Accept All

It is also called Catch-All email addresses. Sometimes receiving mail servers are configured such that it accepts all emails sent to them. This can be usually seen in business email addresses. In many cases, the receiving server accepts all emails of the domain and then simply discard the mail or bounce it back to the sender. Such bounces can hurt the sender's IP reputation and reduce your deliverability so it is not recommended to send emails to "Accept All" addresses or send them slowly with caution. Deliverability for such addresses is not guaranteed.

Disposable Email Addresses

There are certain service providers that generate temporary email addresses for a short period of time, like a few hours to a few days. Such addresses are known as "Disposable Email Addresses". Generally, disposable emails are created to receive initial account activation or confirmation emails for sites like discussion forums, e-shopping, etc and dispose of automatically after the given time period. Sending emails to such addresses increases the bounce rate so it is not advisable to send emails to "Disposable Email Addresses".

Role-based Email Addresses

Role-based email addresses are such emails that do not belong to individuals, but to a department, designation or company. The owner of Role-based addresses often changes. Further, the email may be forwarded to multiple recipients. Sending newsletters or campaign emails to such addresses may have a negative impact on your open rates or may lead to spam complaints. Hence, it is not recommended to send any promotional or marketing emails to Role addresses. Most email marketing services reject such role addresses.

Free service email

QuickEmailVerification detects if the email address is registered with one of the popular free email services, e.g. Google, AOL, Hotmail, Yahoo, etc. This is important, because such addresses are typically personal email addresses, instead of work email addresses. Such addresses are safe to send emails to, but in many cases, engagement opportunities are higher with work email addresses than with personal email addresses.

Did You Mean

Every incorrectly typed email address is a missed opportunity for businesses to connect with their customers and prospects. QuickEmailVerification's in-built auto-corrector checks, in real-time, if there is a typo. The Did You Mean suggestion will provide an alternative spelling which is more likely to be the correct email address. In such a case, the user should be asked to correct the entered email address. For example, if a user types her email address as "", the corrected spelling "" will be suggested.

MX record

Often email marketers need to divide their email lists into service provider wise smaller segments to properly plan and execute their sending strategies. This helps them target their audience in a way that can improve open rates and avoid risking their sending reputation. With every email verified on QuickEmailVerification, we provide the highest priority MX record associated with a specified email address in "mx_record" result field. While sending email, usually highest priority MX records are used to communicate with the mail server.

MX domain

A MX domain name, which is responsible for sending or receiving of emails, can tell a lot about the characteristics of an email account hosted on that domain. QuickEmailVerification also provides the mail exchanger domain name associated with an email address under the result field "mx_domain". This is very useful when you need to organize your email contacts into segments based on the email services. F.e you can set separate segments of emails hosted on Gmail or Yahoo! or any other service which may help you set specifically targeted campaigns.