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https://www.hmailserver.com/forum/viewtopic.php?t=3834
Mar 04, 2006 · Slow delivery. Use this forum if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of all reported issues are already described in detail here.
https://www.hmailserver.com/documentation/v5.0/?page=reference_performance
Delivery threads. hMailServer can deliver several email messages at the same time. This setting lets you define how many messages hMailServer should deliver simultaneously. A higher value will require more CPU usage. A lower value may result in slower deliveries.
https://www.hmailserver.com/documentation/latest/?page=scripting_ondeliveryfailed
This event is executed if delivery to a recipient fails. If a message to multiple recipients cannot be sent, the event is executed once for every recipient. Notice that the event is only executed if hMailServer has accepted a message for delivery. If hMailServer rejects a message, for instance during anti spam check, OnDeliveryFailed is not ...
https://serverfault.com/questions/580234/hmail-delivery-queue-full-with-unsuccesfull-spam
Since a day or two the mail delivery queue of the hMailServer is exploding because someone is trying to send spam via this server. Though the e-mails aren't successfully sent it fills up the mail queue. All SMTP connections require smtp-connections and also the log shows '530 Authentication Required'.
https://docs.aws.amazon.com/ses/latest/DeveloperGuide/troubleshoot-delivery.html
Amazon SES Delivery Problems. After you make a successful request to Amazon SES, your message is often sent immediately. At other times, there might be a short delay. In any case, you can be assured that your email will be sent. ...
https://forums.phplist.com/viewtopic.php?t=36516
Jul 05, 2011 · SOLVED - getting bounce handling working with hmailserver. 5 posts • Page 1 of 1. SOLVED - getting bounce handling working with hmailserver. by xploder » 2:48pm, Thu 30 Jun, 2011 . Hi guys I have been trying to get bounce handling working with Hmailserver ... this will slow down the process to view the statistics, so it is
https://github.com/hmailserver/hmailserver/issues/54
Nov 01, 2014 · hMailServer may run up to 10 virus scanners at the same time. Only workround is to limit the number of delivery threads to 1 (in the performace settings). This will of course slow down delivery and is only feasable if you're pretty much alone in using …
http://myitengineer.com/hmailserver-smtp-protocol-error-550-delivery-is-not-allowed-to-this-address/
May 05, 2016 · You attempt to send emails via HMailServer and receive the following error: SMTP protocol error: 550 Delivery is not allowed to this address. Cause. Sending emails to the HMailServer from a different host is prevented by default as this could result in spamming. Solution. Go to settings => advanced => IP Ranges =>Internet
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