F.A.Q

Frequently Asked Questions
+What is Email Authentication?


Email authentication is a process that checks whether an email comes from where it is supposed to come. If the authentication fails, the emails are mostly marked as spam or declined.

+ What is List Hygiene?


List hygiene is the approach used to manage email addresses systematically by checking email addresses occasionally to avoid email bounces and unengaged subscribers. It makes sure to give a good email deliverability rate.

+ What is an IP Address?


Internet Protocol Address or IP address is a unique numerical tag or address assigned to network hardware that helps you connect your device to other devices.

+ What is IP Reputation?


IP reputation is the reputation of the IP addresses that decide whether an email should be sent to the inbox or spam folder.

+What is IP Warmup?


IP warmup is a procedure done to add email addresses to new IPs to create a positive reputation with the Internet Service Providers.

+What is Sender Mail Transfer Protocol (SMTP)?


Simple Mail Transfer Protocol or SMTP is a communication protocol that transmits electronic mail over the internet.

+What is SNDS?


Smart Network Data Service abbreviated as SNDS delivers the information needed to understand and improve the reputation.

+ What is Gmail Postmaster Tool?


Gmail Postmaster Tool is a tool offered by Google to provide marketers with SPF, DKIM, DMARC failures, spam complaints, IP reputation, encryption success rate, reputation, deliverability, security and performance diagnostics and more.

+ What is GDPR?


General Data Protection Regulation or GDPR is a data privacy policy passed by the European Union on May 25th, 2018. The main objective of GDPR is to safeguard the private data of EU citizens.

+What is an email blackhole?


An e-mail black hole is a valid e-mail address where all the received messages are deleted automatically and cannot be seen. These usually come as automated e-mail messages.

+What is email spoofing?


Email spoofing is an unethical practice that misleads the recipient to open the email on the pretext of being an original sender and make him take an action.

+Explain A/B testing for emails?


A/B test or split test is an experimentation method done between two variants of the same campaign with a small portion of the recipients. The variant that receives the best open, click and conversion rates will be used to target the remaining recipients.

Frequently Asked Questions
+What is the iCubespro predictive keyword recommendation tool?
  • Predictive keyword recommendation tool is an artificial intelligence-powered keyword recommendation engine from iCubespro, that help generate the most suitable, action-oriented and performing keywords to help receive higher open, click and conversion rates for email marketing campaigns.

+How iCubespro predictive keyword recommendation tool works for me?


The iCubespro predictive keyword recommendation tool put forward relevant keyword suggestions based on my email campaign history and performances.

+What all insights do I get from the predictive keyword recommendation tool?


I can receive the recommended audience-specific keyword list, the keyword length to be used for the campaign subject line, the best performing hours and days to send my campaigns

+How iCubesPro predictive keyword recommendation tool benefits me as an email marketer?


iCubesPro predictive keyword recommendation tool can be a boon for email marketers in several ways. It suggests the top-performing keywords to be included in the campaign, length of the subject line, the best performing hours and days to send my email campaigns and the days and hours of top performances of my campaigns. It helps me increase the campaign performance, business revenue and return on investment.

Frequently Asked Questions
+ What is iCubesPro email verification and validation tool?


iCubesPro email verification and validation tool is used to review and validate email lists. Using our tool, email marketers can do single as well as bulk email verifications.

+ How is iCubesPro email verification and validation tool different from other email verification tools?


AiCubesPro email verification and validation tool use the data from domain and mailbox insights to find and flag the potential spam complaints using Abuse Reporter Score. It guarantees the best accuracy rates and offers the fastest turnaround time.

+What do you mean by Catch-all Mailboxes?


There are many mailbox providers like Gmail, Yahoo, Outlook etc that act per the policy to "receive any emails" sent to an email address even if the email is existing or not. This makes it challenging for email verification tools to verify the mailboxes. iCubesPro email verification and validation tool solve this issue for email marketers.

+Do iCubesPro email verification and validation tool offer free credits?


Yes, the iCubesPro email verification and validation tool offer free 100 credits per month. However, you cant carry forward the credits.

+ Is there any expiry for my purchased credits?


No, the credits purchased have unlimited validity. You can also buy credits in bulk in prior, to get discounts.

+How frequently should I verify my email lists?


If your email database has been inactive for at least 3 months, we suggest you to verify and validate it. Verify and validate before you start your email promotions to reduce hard bounces, improve sender reputation and increase email deliverability rate.

+ How precise is the iCubesPro email verification and validation tool?

iCubesPro email verification and validation tool guarantee you a 99% accuracy rate or even better. It also depends on the acquisition techniques used.

+What are the file formats to be used for bulk email list verification?

iCubesPro email verification and validation tool support CSV file format for bulk email verification and validation.

+Is there any need to download and install any other software to clean my email database?

No, you need not install any other software to verify your email lists. iCubesPro email verification and validation tool is a complete verification and validation software. You just need to upload your email list in CSV format and relax.

+ How are credits deducted in the iCubesPro email verification and validation tool?

iCubesPro email verification and validation tool uses one credit per verification. Note that it will not deduct credits for duplicate and invalid emails that cannot be verified.

+ Is there any email address that cant be verified with the iCubesPro email verification and validation tool?

No, you can verify and validate all types of email addresses. The only situation where you can't verify is when the servers are down or unresponsive. In such cases, you can try again later.

Frequently Asked Questions
+What is Email Deliverability?


In simpler terms Email deliverability refers to delivering the mails directly to the inbox as intended rather than delivering them to Spam/Junk folder (Deliverability failure).

+What are different types of Bounces?


The major types of Bounces are soft bounces and hard bounces.

+What are hard bounces?


Email bounces are treated as hard when the addresses are,

  • Entered incorrectly (Typo Errors)

  • No longer in use

  • Acquired from a website by scraping or

  • Purchased from a list service provider

It is perfectly fine to have some hard bounces while bulk mailing is done. However, if the hard bounce ratio is very high Email Deliverability and Inbox placement will start getting affected. Remove hard bounced ids from the mailing list to prevent future delivery attempts and to protect your sending reputation.

+How can hard bounces be reduced?


Hard bounces can be reduced using the following methods.

  • Implement Opt-in process (Single opt-in or Double opt-in)

  • Suppress/ Remove less engaging subscribers.

  • Analyze Subscriber list for Duplicates before mailing and Verify subscribers are opted in.

+What are Soft bounces?


Soft bounces occur when a recipient is not available or the mail is getting blocked at the recipient's end. The mailbox provider or ISP will return a bounce code back to the sender. Soft bounces are a usually indicator of message content quality and relevance.

Normally Soft bounces occurs for,

  • Spammy content

  • Irrelevant Content

  • High number of spam complaints

  • Busy receiving mail server

  • Full or over quota mailbox

+Why users report my mails as spam?


Major reasons people may complain about your messages are:

  • Irrelevant content or the content which the user is expecting is not served.

  • It is easier than finding the unsubscribe URL which is buried in the footer of the email.

  • The recipient trusts the ISP user interface over the unsubscribe URL

  • Too many mails received

+How to Reduce Spam Complaints?


The Spam complaint rate can be reduced by,

  • Keeping content relevant

  • Placing an easily accessible unsubscribe URL

  • Implementing a double opt-in process

  • Purging unengaged users

Email Deliverability can be improved by configuring SPF and DKIM

+What is SPF?


In simpler words, SPF or Sender Policy Framework is a security mechanism created to prevent someone from sending mails in your name. The Mechanism is all about the communication between DNS Servers.

Through SPF, a domain may explicitly authorize the hosts that are allowed to use its domain name. SPF works by publishing DNS resource records that declare which hosts are allowed to use a domain name. The receiving mail server checks the SPF records from the domain identified as sending the email to verify that the source IP which the email originated from is authorized to send email from that domain.

An SPF record is of the form:
v=spf1 +mx a:xog.example.com/28 ~all
Each qualifier has its own meaning.


  • "v" indicates the version of spf being used. Other qualifiers verifies the legitimacy of the email.

  • "mx" and "a" are resource records that are compared between spf record and email to decide whether to accept the mail or not.

  • The mechanisms are combined with qualifiers to determine how to handle a match.

  • + (which is implied if omitted) and -, resulting in a pass or a fail

  • There is also ? for a neutral result and ~ for a softfail.

So the example SPF Record can be decoded as that it uses version 1, passes email if the domain has an MX record matching the sender's address, passes email if the domain has an address record matching xog.example.com/28, and fails all others.

+What is DKIM?


Domain Keys Identified Mail (DKIM) standard has been created for the same reason as SPF: to prevent the bad guys from impersonating you as an email sender. It's a way to additionally sign your emails in a way that will allow the recipient's server check if the sender was really you or not.

With DKIM, a signer can cryptographically sign an email message for a domain, claiming responsibility for its authenticity. The recipient verifies the signature by querying the signing domain for the public key to confirm that the signature was encrypted by the appropriate private key. DKIM-Signatures are generated by code which the signer adds to the appropriate agent.

+How to set a DKIM Record?


The whole idea is based on encrypting and decrypting the additional signature, put in the header of your message. To make that possible, you need to have two keys:

  • Private key (which is unique to your domain and available exclusively to you. It allows you to encrypt your signature in the header of your messages.)

  • Public key (which you add to your DNS records using DKIM standard, in order to allow your recipient's server retrieve it and decrypt your hidden signature from the header of your message).Setting DKIM is just putting the information about the public key into your server's records. It is also a txt record that needs to be put in the right place.

Once you have set that up, each time someone gets an email from you, the receiver's server will try to decrypt your hidden signature using the public key. If it succeeds, this will additionally authenticate your message and in result increase the deliverability of all your emails.

+What is DMARC?


Domain-based Message Authentication Reporting & Conformance, briefed as DMARC is an email verification method that lets you form policies on who can send emails using your domain. This procedure works in such a way that if the DKIM and SPF fail to perform, DMARC will trigger action.

+What is a Feedback Loop?


A feedback loop authorises senders to receive warning messages from users who complained or reported them as spam.

+What is Spam Trap?


Email addresses that are invalid or don't exist are used by internet service providers, anti-spam organizations, and blacklist operators to evaluate the sender reputation and identify spammers.

Frequently Asked Questions
+Why marketers prefer Caspar Short Messaging Solutions?


We partner strictly with the Industry best technology partners with a proven track record, ensuring a direct relationship with the leading network operators and trusted local partners helping our customers to deliver messages glitch free."