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delay receiving email

jlucho
I have a question, hopefully you can guide me if it is a problem in the server, in the network, or it is external. Some emails are received with excessive delay. In my case, in my server for personal use, there are paypal emails that delay in arriving. For example, there is a paypal purchase at 5AM and at 11:50 AM the confirmation email does not arrive yet. although the delay, also happens with other suppliers or senders there are other email providers, which do arrive quickly hotmail, gmail , arrive quickly The resolv.conf I use are: cat /etc/resolv.conf # Generated by NetworkManager nameserver 208.67.222.222 nameserver 208.67.220.220 The incident of the delay in receiving mail, will be some problem in the servers? net ? or will it be external?

Comments

7 comments

Date Votes
  • rpvw
    I have noticed the same thing, and I tracked it down to my use of greylisting. Mail from services like PayPal and my Bank and my ISP uses a number of different IPs to send on, and this causes greylisting to effectively reset each time a new IP in their pool is used - it can take considerable time until the PayPal etc server uses the same mail IP again, and it passes greylisting and gets delivered. I don't know what the answer is here - switch off greylisting and get emails instantly ..... plus an avalanche of spam - or leave greylisting switched on and wait (im)patiently :-D Of course, one could whitelist the IPs for your service, but if the service uses a lot of them, it is a labour of love if you cant get a published MX list for them. You can see some of the problems just by looking at
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  • cPanelMichael
    Hello @jlucho, The previous post is correct in that it's likely related to the Greylisting feature. We document how this works at: Greylisting - Version 72 Documentation - cPanel Documentation Thank you.
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  • keat63
    I disabled Greylisting for this exact reason. Some of our larger customers have many ip's on thier mailserver. Greylisting would see each retry as a different server, putting the mail back in to a holding queue. Some emails could be held for days if greylisting was too strict. Whilst in principle GreyListing is a good idea, in practice, it doesn't work.
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  • rpvw
    I agree with @keat63 in principle, but I wonder if there is something that could be done to enhance the accuracy and functionality of the greylisting ? My knee-jerk reaction was to allow trusted hosts by (user defined) domain names as well as by IP - I realise that then opens up the spam to spoofed mail domains for the domains that have been trusted, but it might prove to be significantly better than no greylisting at all. Additionally, the old bypass for valid SPF has become somewhat redundant as too many spammers are setting that record - but I wonder if one could add a bypass for a DKIM and/or possibly DMARC pass, and whether it would be of any use ? Any thoughts would be appreciated.
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  • cPanelMichael
    Hello @rpvw, We have an existing feature request open to request some enhancements to the Greylisting feature: Greylisting -- requesting enhancements However, it's worth opening a separate feature request if you'd like to see an option to automatically whitelist hosts that pass DKIM and/or DMARC verification. Thank you.
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  • rpvw
    However, it's worth opening a separate feature request

    Thanks @cPanelMichael but cPanel has the only fully working software simulation for general relativity, that proves the existence of black holes. Once a feature request passes the event horizon (after sitting orbiting for days waiting for a moderator approval) it then disappears, never to be seen again, sucked down into some dark singularity that is the database of feature requests, and it might (if one is very lucky, or the moderator is having a good day) end up as far up as on page 34 in any of the lists that are presented to browse through. You should offer it to NASA or CERN - they could use it as a teaching aid ! I really just wanted to provoke a discussion - someone else can have the disappointment of starting the feature request :-D
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  • jeffsherk
    THANKS FOR SOLVING THIS ISSUE :) I was having issues with delayed emails from Dropbox, Bank of America, Stripe, and several other big names. This was a big issue when trying to reset passwords and they were sending me authorization codes that expire in 10 minutes but I would not get the email for a couple hours. I turned off greylisting on all my domains and now all the emails come thru right away.
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