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SMTP Attack?

So for the past couple of months I have noticed our business DSL get completely saturated and basically stop working.  This behavior lasted for a couple of hours and then stopped.

Now it's back with a vengeance.  For the past 3 days our internet has been fully saturated.  I did a wireshark on the external interface and with my little knowledge of wireshark it looks like several yahoo mail servers are sending significant amounts of data our way.  To give you an example we are a 10 person company and our SMTP log for TODAY ONLY is 100MB.

I looked through the log and it looks like a directory harvest attack since all the emails are coming to unkownuser@ourdomain.com.

Another interesting item is that on the dashboard, if I look at the throughput graph, it shows that my External Interface "Out" is what is spiking up to 648Kb (our upload is only 384Kb).  I initially thought that this might be a virus on one of the machines on the LAN but the internal interface traffic is negligible (21Kb).  However with the info I gathered today I started thinking that maybe Astaro is sending undeliverable messages back to the spammers?  If have tried looking for a way to verify this but couldn't find it.

Lots of thoughts and I am really hoping that someone out there may have encountered this in the past.

We are running ASG 7.502.

Thanks in advance!

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0 vwxy566 over 15 years ago
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Not all boots can be worn during winter and fall without sacrificing fashion. In order to give a sense of fashion, some of them are given thin materials that are next to useless when it comes to dealing with plummeting temperature. Others have excess insulation that usually makes the feet to sweat too much and may encourage fungus to settle in.
Traction-wise, others are designed poorly with slick soles and heels resulting to significant loss of traction which is very dangerous in icy or snowy situations. Too rigid soles, on the other hand, can create the feeling of rigidity in walking and may make walking a challenge .considering safe and comfy during winter and fall demands boots with good insulation and traction. That means looking for those kinds with excellent comfort and fashion balance designs. The answer is Ugg ladies boots. [size=2][img=498,307]www.ugsell.com/.../ugg_new_boots.jpg
[/img][/size]
Choosing the right Ugg boots depends on one's taste. If one prefers an overall protection for the feet, choosing the classic tall boots would be an excellent option. Should one opt to go for those that only cover until the bottom of the calf; short boots are the right choice. For people who may want to sacrifice a little degree of comfort without fully discarding them and yet remains in style, getting the classic cardy boot is the best choice. While it may look like a pair of normal knit shoes and may not be a great choice for really harsh weather, it certainly makes a statement if worn during normal cold days.
Children also benefits from the comfort and fashion sense that these products bring. Even toddlers have their unique and sheepskin designs. This creates a settling feeling for parents knowing that their kid's feet are fully protected and comfortable during cold periods. Most of them are built with kid safety in mind. Emphasis is given on making sure more traction to the soles is attained for those still learning to walk.
In general, they are designed for all ages. Most of them are uni*** so it is common to see a mix-up of users sporting the same exact model. Facing fall and winter is no longer that worrisome if Ugg boots are around.
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0 vwxy566 over 15 years ago
When winter comes you maybe have a good point to ponder in choosing between comfort and fashion for footwear. Most shoes and ugg ladies boots designed for comfort, are not always in for fashion, and those that are fashionable are not that comfortable. The arrival of winter most would opt for comfort and warmth than being trendy With Ugg boots. However, one can definitely go out in fashion while staying fully insulated from the cold.
Not all boots can be worn during winter and fall without sacrificing fashion. In order to give a sense of fashion, some of them are given thin materials that are next to useless when it comes to dealing with plummeting temperature. Others have excess insulation that usually makes the feet to sweat too much and may encourage fungus to settle in.
Traction-wise, others are designed poorly with slick soles and heels resulting to significant loss of traction which is very dangerous in icy or snowy situations. Too rigid soles, on the other hand, can create the feeling of rigidity in walking and may make walking a challenge .considering safe and comfy during winter and fall demands boots with good insulation and traction. That means looking for those kinds with excellent comfort and fashion balance designs. The answer is Ugg ladies boots. [size=2][img=498,307]www.ugsell.com/.../ugg_new_boots.jpg
[/img][/size]
Choosing the right Ugg boots depends on one's taste. If one prefers an overall protection for the feet, choosing the classic tall boots would be an excellent option. Should one opt to go for those that only cover until the bottom of the calf; short boots are the right choice. For people who may want to sacrifice a little degree of comfort without fully discarding them and yet remains in style, getting the classic cardy boot is the best choice. While it may look like a pair of normal knit shoes and may not be a great choice for really harsh weather, it certainly makes a statement if worn during normal cold days.
Children also benefits from the comfort and fashion sense that these products bring. Even toddlers have their unique and sheepskin designs. This creates a settling feeling for parents knowing that their kid's feet are fully protected and comfortable during cold periods. Most of them are built with kid safety in mind. Emphasis is given on making sure more traction to the soles is attained for those still learning to walk.
In general, they are designed for all ages. Most of them are uni*** so it is common to see a mix-up of users sporting the same exact model. Facing fall and winter is no longer that worrisome if Ugg boots are around.
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Vote Up 0 Vote Down

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