[olug] ISP email filtering etc...

[Sam Tetherow]

Several options:
Hosted - let someone else deal with the headache, several options here, 
serverplus being a good one.
Postini - (not as popular as it once was) either acting as mail host or 
as a passthrough filter.
Appliance - probably the most popular being barracuda
Roll-your-own using spamassassin and clamav

Most ISPs will either require you use POP or have a quota on the mailbox 
(or both).

Spam filtering is getting pretty aggressive now a days due to the shear 
amount of crap that comes through.  Usually, reject un-resolvable host 
names, grey listing, rbls and some sort of content filtering (such as 
spam assassin) are all used together, most ISPs honor SPF records if 
they exists, but I don't think many (if any) require it, there is too 
much legacy out there that don't provide SPF records for their domain.

Spam is usually expired after a reasonable interval (like 2 weeks)


If I had it to do all over again, I wouldn't even offer email service as 
an ISP, but gmail wasn't an option when I started.  I doubt I would host 
it myself, and I'll probably outsource if anything drastic happens in my 
current setup.  There is just way too much headache involved in managing 
an ISP mailserver.

On 09/13/2012 02:33 PM, jman at miwire.com wrote:
>     Just looking to query thoughts about what an ISP does to maintain email
>     services.
>
>     Sure there are spam filters, grey-listing and rejects.  What are the
>     trends? Is an email domain rejected because it's IP doesn't resolve?
>     What is it resolves, do you require an SPF How much of your customers
>     email do you store in spam? Do you keep it there indefinitely?
>
>      Thanks for your thoughts....in advance.
>
>     John
>
>
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