SPAM filtering taking forever

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Posted by ClarLabs, 05-25-2015, 05:33 AM
Hello WHT I have a somewhat small issue, I am trying to speed up my email service but SPAM filtering takes forever run its checks meaning that some email takes around 30 minutes to enter a clients inbox, I turned spam filtering off in Plesk 12 the same email instantly arrived in the inbox, so I know it is the SPAM filter that is slowing down email delivery. I was wondering if you amazing professionals could give me some advice on how I would speed up SPAM filtering so that inbox delivery is amazingly fast and does not feel sluggish. I am looking forward to your reply. Yours Sincerely Chris Russell
Posted by UrDN, 05-25-2015, 05:39 AM
What spam filter is it using?
Posted by ClarLabs, 05-25-2015, 05:46 AM
I am using Spamassasin, with Postfix+Dovecot as the mail server and imap/pop3 server
Posted by servopia, 05-25-2015, 06:04 AM
It must not be taking this much time in general. There must be some specific tweaks in SpamAssasin that you have enabled which are blocking the delivery. Every Email hosting provider must setup SPAM filter but if they start to delay the delivery by 30min., everyone would certainly switch to something faster!
Posted by UrDN, 05-25-2015, 06:14 AM
Is the process consuming a lot of resources during the 30 minutes period?
Posted by ClarLabs, 05-25-2015, 06:15 AM
Not that I am aware of.
Posted by UrDN, 05-25-2015, 06:22 AM
Any log file?
Posted by Chris-M, 05-25-2015, 06:24 AM
Do you have grey-listing support enabled? If so, turn it off as it will add delays to incoming messages from unknown senders. http://download1.parallels.com/Plesk...Name=63249.htm
Posted by ClarLabs, 05-25-2015, 06:38 AM
umm... I turned of greylisting and emails are coming in really quickly, is turning of greylisting a security risk
Posted by Chris-M, 05-25-2015, 06:30 PM
Greylisting is a spam filtering technique which is designed to add a delivery delay to mail from unrecognised senders (the server temporarily rejects the message). The receiving server (yours) waits for the sending server to retry the delivery which was initially rejected. If and when the delivery is retried, your server then whitelists mail from the sending server for a period of time so that future delivery attempts will not incur any delays. The reason this is effective at reducing spam is because a lot of spammers won't retry deliveries that have initially failed. If you turn it off you will receive more spam but won't experience delays. It does not pose a security risk either way.