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Email bounces

Email bounces occur when an email doesn't reach the recipient and is returned to the sender. Bounces can be due to varying reasons. However, they are largely categorised as hard and soft bounces.

  • Hard bounce occurs when your emails fail to reach the recipients due to a permanent reason. Examples: incorrect recipient email address, fake email ids or some IPs being deliberately blocked by the recipient servers.
  • Soft bounce on the other hand occurs due to temporary reasons, which usually clear up in a while. Examples: receiving server being temporarily down, the size of the email being large or the recipient's inbox being full. 

It is important to keep your email bounces to a minimum to ensure good deliverability of your transactional emails.

For more insights on email bounces, refer our Email bounces guide.

Bounce reports

ZeptoMail has a dedicated Bounce reports dashboard that gives extensive information on email bounces. This categorization helps you analyse bounces across Mail Agents and domains which helps you get to the root of things and handle them better. 

Bounce report sections

  1. Bounce count
  2. Analysis report
  3. Bounces by domains
  4. Bounce by Mail Agents

Bounce count

The bounce count at the top gives you the total number bounced emails of the total emails sent from your account. You can also view the percentage value next to the data. 

This bounce value can be viewed based on the desired time range too. To do so, click on the time range drop-down in the right and select the desired time period. 

The section right below gives you a detailed split-up of the bounce count. 

Filter criteria

You can filter the bounce data based on the Mail Agent or domain and view the information.

  1. Mail Agent filter - Once you select the Mail Agent filter, you can either opt to view bounce data from all Mail Agents or specific Mail Agent. To view stats from a specific Mail Agent, select the desired Mail Agent from the drop-down on the right. 


     
  2. Domain filter - This is similar to the Mail Agent filter. You can either opt to view bounce data from all domain or specific domain. To view stats from a specific domain, select the desired domain from the drop-down on the right. 


     

For the selected value, the total number of bounces and the timeline of the bounce occurrence. You can also select the time range over which you wish to view the data from the drop-down on the right. 

Analysis report

  • The analysis report of the bounced emails gives the exact reason for the bounces and emails that have encountered them. 
  • ZeptoMail categorises email bounces to understand the reason behind them better. Given below are a comprehensive list of bounces encountered by transactional emails.

ERROR

DESCRIPTION

Connection Issues

Host not reachableWhen the recipient server does not accept the connection request or is unresponsive.
Relaying errorWhen the message is not relayed between servers.
Protocol errorIndicates a TLS handshake failure between the sender and the receiver. 
Routing errorWhen the recipient server is unable to route the emails to the recipient's domain. Can occur due to DNS issues and misconfiguration of router settings.
Connection refused errorWhen the recipient rejects the connection attempt from the sender due to reasons like IP or domain reputation or poor DNS configuration.
Temporary errorAn error caused by any temporary issue and can be resolved once the email sending is retried.

Policy failure

Policy rejectionWhen the sender fails the recipient's policy settings and limitations.
Over quotaWhen the recipient's email account has reached its default space limit.
Bad configurationOccurs due to some error in the recipient server setting. As a result, it might be rejecting incoming emails.
Too many recipientsWhen the list of recipients exceeds the number set by the sender.
Black listedWhen the recipient has marked the sender as suspicious and blocked incoming emails from that sender.
Grey listedThis is temporary error that occurs when the recipient is set to reject emails from new IPs and domains.
Sender IP errorOccurs when the recipient may have blocked the sender's IP due to poor sender reputation.

Spam

Flagged as spamWhen the email lands in the spam folder due to deliverability issues.
Virus detectedWhen the email's links or attachments have been flagged as a possible virus by the recipient's email filters.

User not found

Unknown userRecipient email address does not exist in the organization or domain.
Inactive mailboxWhen the recipient's mailbox is not in use.

Invalid DNS

Invalid DNS recordsRecipient server unable to deliver the message because of DNS configuration issues on their end.
  • This report lists the reasons for the bounce in the descending order of their percentage and count. Each category of bounce error has sub-categories that pin-point the exact reasons to help you solve them better. 


     
  • Each category report lists all the emails that have encountered that particular error in the selected time range. Select the View emails button to list the emails that have encountered a particular error.

Chart and download options

The bounce data can either be viewed in graphical format or as in a tabular format. You can choose the one of your choice from the top-right corner. 

Further, you can also download the data for a later use. The supported formats are:

  • JPEG
  • PNG
  • SVG
  • CSV
  • PDF

Bounces by Domain

This section gives you domain-specific bounce information. A pie-chart of all domains that have encountered an email bounce will be available. The data is listed based on the number of emails and their percentage. The information can be viewed in the desired time range. 

  • You can also view the list of emails that have bounced in a particular domain. 


     
  • There is an expanded view of the bounce stats for better clarity.

You can also download the graph in the desired format for future references. The supported formats are:

  • JPEG
  • PNG
  • SVG
  • CSV
  • PDF

Bounces by Mail Agents

This section gives you Mail Agent-specific bounce information. A pie-chart of all Mail Agents that have encountered an email bounce will be available. The data is listed based on the number of emails and their percentage. The information can be viewed in the desired time range. 

  • You can also view the list of emails that have bounced in a particular Mail Agent. 


     
  • There is an expanded view of the stats for better clarity.


     

You can also download the graph in the desired format for future references. The supported formats are:

  • JPEG
  • PNG
  • SVG
  • CSV
  • PDF

Note:

Before you get started it is important to know that ZeptoMail is for sending transactional emails like welcome emailers, password resets emails, OTPs. We do not support sending of bulk emails or promotional emails like newsletters or marketing campaign emails. If you are looking for a bulk email provider, you can visit Zoho Campaigns.