Track delivery - connection problem

Endurand

• August 28, 2021 03:40

Hi, I send emails and go to track delivery to check delivery status. Some of them get successfully sent, but some get "Connection refused" status. After 15 or so minutes, I guess the server tries to send them again and they get sent successfully. Also, I get the "Connection timed out", and "Retry time not reached for any host for..." status. What could be causing this? I worry because for now, I have a 10 email list. I'm planning to have 1000+ emails, but if I have problems with sending 10, what could happen with 1000+..

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  cPRex Jurassic Moderator

  • August 30, 2021 13:31

  Hey there! It really depends, and I'm not sure there's going to be a good way to answer it. The most likely explanation I can think of is that the remote server has some type of greylisting set up similar to cPanel's here: Greylisting | cPanel & WHM Documentation This tool temporarily rejects a message, causing the mailserver to attempt a retry. If it does retry, that is an indication it is a valid mailserver and not some automated tool sending spam, and then the message is accepted. There isn't really a way to verify this, although checking the logs directly in the /var/log/exim_mainlog file may give you more details about the specific delivery attempt.

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  Endurand

  • September 01, 2021 07:33

  Hey there! It really depends, and I'm not sure there's going to be a good way to answer it. The most likely explanation I can think of is that the remote server has some type of greylisting set up similar to cPanel's here:

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  cPRex Jurassic Moderator

  • September 01, 2021 12:38

  I actually meant greylisting on the recipient's end, so that isn't something you'd be able to test. The .htaccess file on the server wouldn't be related to the email issues, but public_html should be 755 and the .htaccess file should be 644.

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  Endurand

  • September 02, 2021 11:44

  I actually meant greylisting on the recipient's end, so that isn't something you'd be able to test. The .htaccess file on the server wouldn't be related to the email issues, but public_html should be 755 and the .htaccess file should be 644.

  
  I'm sorry, I don't think that is the problem. I tested this; I sent the emails to myself "@gmail.com", I know for a fact that greylisting is not turned on by my side, but still, sometimes server gets the connection refused for the first few attempts..

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  cPRex Jurassic Moderator

  • September 02, 2021 13:18

  Interesting - if it's "connection refused" that almost sounds like there is a network error on the server. Can you try changing your /etc/resolve.conf file to the following to see if that changes the behavior? You can just comment out any existing lines in that file and use these for testing: nameserver 8.8.8.8 nameserver 8.8.4.4
  

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  Endurand

  • September 03, 2021 07:23

  Interesting - if it's "connection refused" that almost sounds like there is a network error on the server. Can you try changing your /etc/resolve.conf file to the following to see if that changes the behavior? You can just comment out any existing lines in that file and use these for testing: nameserver 8.8.8.8 nameserver 8.8.4.4
  

  
  Thank you so much for taking the time to help me.. I changed nameservers to what you said and still, I get the connection refused status, and again after few attempts, the email gets accepted. I send to the same email addresses every day and every day different email address creates problems.

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  cPRex Jurassic Moderator

  • September 03, 2021 13:11

  I can't think of a logical reason that behavior would happen. At this point it would be best to submit a ticket to our support team so we can check the system directly and see if we are able to get more information. If you are able to submit a ticket, please post the number here so I can follow along.

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  Endurand

  • September 07, 2021 07:40

  I can't think of a logical reason that behavior would happen. At this point it would be best to submit a ticket to our support team so we can check the system directly and see if we are able to get more information. If you are able to submit a ticket, please post the number here so I can follow along.

  
  What is this for? (check attachment) Could this make me deliverability problems?

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  cPRex Jurassic Moderator

  • September 07, 2021 13:23

  That warning is just letting you know that DNS is not controlled by the local WHM server. That would not be related to the previous issues you were experiencing.

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  Endurand

  • September 08, 2021 08:19

  That warning is just letting you know that DNS is not controlled by the local WHM server. That would not be related to the previous issues you were experiencing.

  
  Could this be causing it? Delivery user: when fails its "-system-"; when the email is sent its "-remote-"?

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  cPRex Jurassic Moderator

  • September 08, 2021 13:03

  That could definitely be an issue - do you know the difference in the way those messages were sent? Was one possibly sent using an automated form?

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  Endurand

  • September 10, 2021 07:07

  That could definitely be an issue - do you know the difference in the way those messages were sent? Was one possibly sent using an automated form?

  
  I send my emails via mailwizz. This is the same email, only the first time it got "Connection Refused", then the server automatically tries to send that email again after 10 or so minutes then it gets accepted.. I don't know why the first time it was -system-, and the second try it was -remote-. It is literally the same email.

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  cPRex Jurassic Moderator

  • September 10, 2021 13:24

  I also have no idea why that would be happening. Does the same issue happen when a message is sent directly from Exim/webmail/a client or does this only happen through Mailwizz?

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  Endurand

  • September 13, 2021 09:44

  I also have no idea why that would be happening. Does the same issue happen when a message is sent directly from Exim/webmail/a client or does this only happen through Mailwizz?

  
  It also happens when I use RoundCube...

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  cPJustinD

  • September 13, 2021 18:30

  Hi there! This certainly sounds strange, and without the ability to replicate on our end, it would be difficult for us to determine what exactly is occurirg. I think cPRex has the right idea here -it may be best to open a support ticket so that our analysts can review the issue more thoroughly and determine what exactly is occurring. You can submit a support request using the "Submit a ticket" link in my signature below. Please be sure to link this thread when opening the ticket and provide the ticket number here so that we can track the issue appropriately. If possible, please post the resolution on this thread as it may help other community members with similar issues.

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  Endurand

  • September 29, 2021 07:23

  Hi there! This certainly sounds strange, and without the ability to replicate on our end, it would be difficult for us to determine what exactly is occurirg. I think cPRex has the right idea here -it may be best to open a support ticket so that our analysts can review the issue more thoroughly and determine what exactly is occurring. You can submit a support request using the "Submit a ticket" link in my signature below. Please be sure to link this thread when opening the ticket and provide the ticket number here so that we can track the issue appropriately. If possible, please post the resolution on this thread as it may help other community members with similar issues.

  
  Ticked ID #94367488

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  cPRex Jurassic Moderator

  • September 29, 2021 12:48

  Thanks for that - our team did reply to that ticket with more details.

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