[olug] ISP email filtering etc...

[jman at miwire.com]

   More info......I take care of an ISP.....spam, milters, sendmail,
   procmail and associated Mysql even monitoring etc. I was just lokoing
   to see what the standards are for rejecting, archiving etc. Trying to
   keep in touch basically.

    Which is why I appreciate the feedback....

   Sam Tetherow <tetherow at shwisp.net> wrote ..

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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