Why some people never receive email from PROCONF

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  • A wrong email has been provided

An error occurred while trying to deliver the mail to the following recipients:
abusalyh43@gmaill.com

Reporting-MTA: dns; c180-41.smtp-out.ap-south-1.amazonses.com

Action: failed
Final-Recipient: rfc822; abusalyh43@gmaill.com
Diagnostic-Code: smtp; 550 4.4.7 Message expired: unable to deliver in 840 minutes.<421 4.4.1 Unable to connect to remote host>
Status: 4.4.7

  • The recipient’s inbox is out of storage space. Here is an example 
An error occurred while trying to deliver the mail to the following recipients:
tazrianalam11@gmail.com
Reporting-MTA: dns; c180-16.smtp-out.ap-south-1.amazonses.com

Action: failed
Final-Recipient: rfc822; tazrianalam11@gmail.com
Diagnostic-Code: smtp; 554 4.4.7 Message expired: unable to deliver in 840 minutes.<452-4.2.2 The recipient's inbox is out of storage space. Please direct the<CRLF>452-4.2.2 recipient to<CRLF>452 4.2.2  https://support.google.com/mail/?p=OverQuotaTemp d9443c01a7336-1f9eb3cd271si58938635ad.342 - gsmtp>
Status: 4.4.7
  • Unable to lookup DNS for a website. For example in the following example istt.edu DNS is not found.

An error occurred while trying to deliver the mail to the following recipients:
tanjilsharif_cse@istt.edu

Reporting-MTA: dns; c180-40.smtp-out.ap-south-1.amazonses.com

Action: failed
Final-Recipient: rfc822; tanjilsharif_cse@istt.edu
Diagnostic-Code: smtp; 550 4.4.7 Message expired: unable to deliver in 840 minutes.<421 4.4.0 Unable to lookup DNS for istt.edu>
Status: 4.4.7

  • No Such User exists
An error occurred while trying to deliver the mail to the following recipients:
ronokhashaneee.iu@gmail.com
Reporting-MTA: dns; c180-15.smtp-out.ap-south-1.amazonses.com

Action: failed
Final-Recipient: rfc822; ronokhashaneee.iu@gmail.com
Diagnostic-Code: smtp; 550-5.1.1 The email account that you tried to reach does not exist. Please try
 550-5.1.1 double-checking the recipient’s email address for typos or
 550-5.1.1 unnecessary spaces. For more information, go to
 550 5.1.1  https://support.google.com/mail/?p=NoSuchUser 98e67ed59e1d1-2cfdc42ec40si1953515a91.10 – gsmtp
Status: 5.1.1
  • Email address can be in PROCONF Suppression list

There are several reasons to send an email to a PROCONF suppression list. This list automatically adds suspicious emails and makes them safe through human and AI intervention.

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