How to verify emails and clean email list

How to verify emails & clean email list

Email Marketing is not easy; it’s not only about crafting a perfect subject line, email copy, placing the CTA right, or including powerful images. A lot of background work is involved. One such work is verifying and cleaning the email list. Let’s take a situation, you are ready with your email campaign, and you upload your email list, now suddenly the progress stops and shows you need to verify your email list. What next?

Let's understand how to verify emails and clean email lists in detail.

What is email verification?

Email verification is the way to ensure that your lists of emails are connected to an inbox. It helps to increase the deliverability of your email lists further, allowing you to reach your customers. Email verification is an integral part of best practices in email marketing.

You may use email verification services like Mailmodo to conduct a bulk validation of the entire mailing list or to validate inbound email addresses in real-time. Mailmodo uses API integration to avoid fake registration and ensure that unintrusive information is never stored in your application. Real-time verification and double opt-in procedures help you accumulate a list of contacts that are safe and active. Nevertheless, as a good practice, you should periodically check the data to avoid invalid emails over time.

How does an email verifier work?

The email validation procedure involved different steps, consisting of syntax and formatting test, server confirmation, and mailbox validation, each taking just half a second. The following is the general method for how email verification functions, although the various verification systems are subject to specific processes and procedures.

Syntax check

The following are the checklist for syntax control algorithms:

It checks the local-part, the at-symbol ( @ ), and a domain name with a dot-symbol ( . ) are present, it doesn’t allow more than 64 characters in the local-part, proper placement of dots (.) and the symbols (@), special characters (? “ # $ % & ` * + _- . / | \ ^ {}) can only be used in the local part of an email address, but not in the beginning or at the end of the local-part. It checks common mistakes like periods (.) in the start or at the end of email address, commas (,) instead of periods (.), semi-colon (;) or apostrophe (‘) instead of the at-sign (@). Further, verification is there for the spaces or blank areas ( ) in the middle or at the end of the address, double periods (..) in the local part or domain name, missing “.com” or period ( . ) in the address, or any misplaced signs (@).

Before ISPs (Internet service provider) or ESPs (Email Service provider) are caught, it detects any issues and possible problems.

Email verification typically includes testing the spam traps mailing list–email addresses created to track senders who do not follow the appropriate practices. The best email verification services like Mailmodo test your address list automatically in line with uniform email formatting requirements and provider-specific email formatting requirements. It checks the emails' format (formalization and syntax check). It involves checking for misplaced @ symbols the mailing list, incorrect email addresses, and other items that could contribute to a problematic rebound. For example, if someone puts an email id as or srijan#@gmail, com in such cases, the verification engine detects both the local part and the domain portion of an email address issues within seconds.

Email verifier makes sure that these mailing lists exclude certain emails. If not, you will be either told to delete your email address from your list or blacked out by ISPs and ESPs if you send an email to a spam trap.

Domain existence check

Email verification services check that the domain name is correctly written and that the web and domain are real and operational. For example, if someone entered the email address:, if the domain under is not registered, an email verifier would mark it not valid.

MX record check

MX record specifies the mail server to accept emails for a specific domain. The solution to classify garbage emails is more complicated. This feature verifies that the email exchange entry in the email address is present, registered, and the host domain name can be accessible online.

Catch-all domain check

An email verification also verifies that the email is part of an entire domain. The sort of domain you always allow mail is the catch-all domain (which often is called unverifiable or appropriate), even though you are writing gibberish in the local part of the mail.

The domain name is verified automatically for catch-the-all by a credible bulk email verifier like mailmodo. You will act at your own risk if you use a verified email as a catch-all email to choose whether you want to send or delete messages from the list once and for all anyway to send the emails.

SMTP authentication (email address ping)

Individual mailbox validation is the final step in the process.

For this purpose, email verification services use the SMTP protocol to ensure that there is a mailbox and messages can be sent. This is done automatically without sending an email response through a legitimate email validation service like Mailmodo.

For example, if someone writes an email id instead of writing, the email verification will send out a signal at this point and check if this mailbox will accept messages.

Why is email verification so important?

Generating lead is a part of a digital marketer, but how would you be sure of the quality you are receiving is valid. This is why email verification is necessary.

Also, it keeps your email lists up to date. 22.5% of email addresses are invalid annually, according to a survey by HubSpot. It is most likely due to changing the company and deactivating the company email addresses. It might impact your deliverability rate as the hard bounce rate might exceed the allowable rate if you don't test email lists frequently, and the credibility of the sender will get a real hit. Maintain your email list free of typos, fake, and provisional email accounts that can impact your deliverability. The last thing you might wish is to avoid getting into the spam folder or refusing your emails because of poor data quality.

An email service provider like mailmodo automatically cleans up the entire list regularly to avoid the old and harmful emails that were once healthy.

Types of Email verifiers

Software email Verifier

Verifying services, such as AtomPark, may provide a reasonable solution for bigger businesses where one person is responsible for lead list management and verification. The benefits are clear: single charge, unlimited email searches, and full database ownership. However, software email verifiers have quite a few inconveniences: installation updates, back-ups needed (i.e., not automatic cloud storage), access to one device, PC and OS requirements restricted, and no integrations needed.

SaaS email verifiers

Provide a cloud-based framework that allows you to use the browser to access all data stored in the cloud directly. Check mailmodo, a saas tool for all your email marketing needs, offering a subscription-based model.

Many advantages include unrestricted access from every part of the world to your account and database, team choice, no limitation in OS, APIs, and a toolbox also included with one subscription.

How to choose the best email verification system?

There are various email verifiers out there. They are equally consistent with their algorithms, servers, programming, and optional service. You will try and figure the one that is perfect for you. Below are some tips for finding the best email verification service.


Before trusting any service with your most precious assets, don't risk losing, stolen, or selling your data. See their website for information on their physical address, telephone, and email help. Please contact them to ask some questions, ensure that they are answered and updated.


Seek to find the perfect service at the best price from the website. Check the price per 10000 email verification. Remember, the cheapest choice is not always the best choice.

Verification method

Not everybody on websites shares how the verification process is carried out. However, you would like to do your research to make sure the reports are correct. Check the verification method of the mailmodo.

Extra services

Check what all other features and benefits are given by different service providers. There’s no point in switching between a dozen players if you can all get them on a single platform.

API Verification

You will need an API to implement email verification on your platform or product directly. It is not a must-have for any email verification platform, but it opens up email verification possibilities in ways that you have probably not considered before.


A vital component of any excellent email verification service helps (preferably person, 24 hours a day). Ensure that your chosen service has at least two ways to reach the team if you have questions or problems.

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