Postfix Slow

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Postfix Slow

Hungry Snail
Hi Guys,

At certain times of the day Postfix starts delaying incoming email by up to an hour, does anyone know what would cause this and how to fix it?

the process list has a lot of the following...

postfix  15464  1.0  0.0   4836  1800 ?        S    15:06   0:00 smtp -t unix -u -c
postfix  15465  1.0  0.0   4696  1576 ?        S    15:06   0:00 error -n retry -t unix -u
postfix  15466  0.0  0.0   4732  1588 ?        D    15:06   0:00 bounce -z -n defer -t unix -u -c
postfix  15451  0.0  0.0   4728  1580 ?        D    15:06   0:00 bounce -z -n defer -t unix -u -c
postfix  15452  1.0  0.0   4832  1784 ?        S    15:06   0:00 smtp -t unix -u -c
postfix  13319  0.0  0.0   4732  1592 ?        D    15:01   0:00 bounce -z -n defer -t unix -u -c
postfix  13328  0.0  0.0   4832  1884 ?        S    15:01   0:00 smtp -t unix -u -c

I'm guessing a setting can be changed to stop these slowdowns (which I assume are being caused by spam)?

Regards