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Second-level Codes

Last updated by Roshan Jonah on August 21, 2017 13:14

These are displayed when we specifically have information regarding its qualification into this criterion. If not, you will mostly only see the Top-level codes only…

Invalid Email

This is when the email address syntax is out of place or when the mail server explicitly confirms that it’s non-existent. It also occurs when there are unbalanced delimiters. Some of these syntax issues are addressed by our software while some are challenging to fix by our software’s algorithms and requires manual correction. We recommend removing these addresses from your mailing list, as there is a high likelihood of a non-existent email.

Invalid Domain

This occurs when the email address related domain is invalid or is non-existent. These include domains, which have never been registered, and some, which have been registered in the past but have failed to renew or have proper MX servers to receive email. We recommend excluding these from your mailing list, as no MX server exists to receive your email campaigns.

Rejected Email / Cannot Connect / Timeout / Invalid SMTP / Unavailable SMTP

This occurs after verifying the domains or email validity and email address syntax pass. It gives you confidence that a certain mailbox is unavailable although the receiving MX servers, domain and other, variables are working perfectly to accept email. Sometimes, we are unable to connect to SMTP and this could be because they are busy processing other requests or under upgrade. It is best to try these out again at a later time. We suggest that you exclude these addresses from your mailing list as they are highly likely to bounce back as belonging to non-existent users. 

Low Quality / Low Deliverability

Any email address that has related domains that belong to a temporary, role, spam trap, complainer or other such emails will mean it probably is valid but is a low-quality address. Sending to the emails in this category would usually mean low response rates and therefore low ROI for your email marketing campaigns. 

Accepted Email

It signifies that an email address is valid and working. We are able to get a green signal for delivering to the intended recipient. You can send to the email addresses in this category with confidence and see a good response rate from them.

For gaining a better understanding of email verification codes, we suggest you read the Top-level codes article.