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help needed: mails are delayed several hours

Sven L.

Regular Pleskian
Hello,

could anyone point me where and how to start researching this problem a customer reports:

- they send an email at 16:00
- it doesn't arrive until 18:30


i have discarded local problems already. could it be greylisting related even tho it happens to mails between the same domain?
where should i start looking?


plesk 9.5.4 on ubuntu 10.04 and postfix
(i do realize there is no more official support for this version, but i will not update to 11.x when the 11.x forum is filled with dozens of bugs every day)
 
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