How a same mail deliver many times

I think you're asking how a single email can be delivered multiple times. This can happen due to various reasons. Here are some possible explanations:

  1. Email forwarding: If an email is forwarded to multiple recipients, it can be delivered multiple times. Each recipient may receive a copy of the original email, resulting in multiple deliveries.
  2. CC/BCC: When an email is sent with CC (carbon copy) or BCC (blind carbon copy) recipients, the email is delivered to each recipient individually. This can lead to multiple deliveries, especially if the email is sent to a large number of recipients.
  3. Email clients: Different email clients (e.g., Gmail, Outlook, Yahoo) may have different ways of handling email delivery. For example, some email clients may download emails in batches, while others may download them individually. This can result in multiple deliveries of the same email.
  4. Email servers: Email servers can sometimes misdeliver emails or send them multiple times due to technical issues, such as misconfigured server settings or network connectivity problems.
  5. Spam filters: Spam filters may flag an email as spam and deliver it multiple times to the recipient's inbox, thinking it's a legitimate email.
  6. Email marketing campaigns: Email marketing campaigns often involve sending the same email to a large number of recipients. If the campaign is not properly configured, it can result in multiple deliveries of the same email.
  7. Email archiving: Some email archiving systems may store multiple copies of the same email, leading to multiple deliveries.
  8. Email client caching: Some email clients may cache emails locally, which can result in multiple deliveries if the client is not properly configured to handle cached emails.
  9. Email server caching: Email servers may also cache emails, leading to multiple deliveries if the cache is not properly cleared.
  10. Human error: In some cases, a user may accidentally send the same email multiple times, resulting in multiple deliveries.

These are just a few possible reasons why a single email might be delivered multiple times. If you're experiencing this issue, it's a good idea to investigate the specific cause and take steps to prevent it from happening again.