Volker Eckert writes:
the mailq contains some hundreds of messages at times because of other accounts that are aliased to gmx accounts, with the gmx mail server limiting the number of e-mails it accepts per hour. in turn courier is trying to re-send these messages every time it wakes up which takes a
This is not the case. Each individual message is retried on its own schedule. There is no frequent wakeup either, except for an occasional restart which, if possible is scheduled when nothing else is pending.
couple of minutes. since the gmx mail server blocks my courier server for a couple of hours (3 or four, IIRC) this re-sending occurs quite often.my questions:* is it probable that these frequent re-sending attempts are the reason why courier is not accepting incoming messages?
No, not as a direct consequence.
* what other possibilities are there?
If a message to a given email address cannot be delivered, Courier will not accept any more messages to the undeliverable address, as long as the message remains undeliverable. Once the message is succesfully delivered, Courier will resume accepting mail to that address.
This is done for individual email addresses only. If one email address is undeliverable, mail to that address will temporarily not be accepted. Mail to other addresses, even from the same domain, will continue to be accepted.
* how do i configure the re-sending / shutdown+wakeup interval?
There are some knobs that let you control the scheduling parameters, they are documented in the courier(8) man page. However I don't think you have the correct impression on what's really going on in the first place. Each message, for the duration of its existence in the mail queue, carries a unique ID that's logged. You should pick a sample message and scan for its ID, in the logs, to see for yourself when and when not delivery attempts for this message occur. This will help you understand what's going on.
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