[kwlug-disc] So, I took the plunge... Mail In A Box

[Mark Steffen]

Not just the outbound port 25 block issue with running a mail server on a
residential-type connection, but also consider you're going to have
reputational problems.

There are a bunch of RBLs that many mail server admins use to cut down on
all the junkmail out there.  dyna.spamrats.com and relays.sorbs.net are two
off the top of my head.  Dynamic ranges (eg home ISP connections) are
blacklisted as they are seldom a source of legitimate email.  Also, many
mail servers check to make sure there is a proper PTR records which match
your mail server's hostname.  With a static IP from teksavvy you might be
ok (and they may be willing to update the rDNS for you), but you'll want to
run your IP through anti-abuse.org's multi RBL checker also.

YMMV :)

*Mark Steffen*
Office Direct: +1.226.476.1240 | Mobile: +1.226.600.0464
*"Don't believe everything you read on the Internet." -Abraham Lincoln*



On Thu, Feb 22, 2018 at 2:09 PM, Stuart Seeley <stuart at lowlevel.ca> wrote:

> Yeah, that outbound block has been in place for many years... keeps all
> the infected computers from being able to send spam.
>
> Stuart
>
> On Thu, Feb 22, 2018 at 11:05 AM, bob+kwlug at softscape.ca <
> bob+kwlug at softscape.ca> wrote:
>
>> The real Bob wrote:
>>
>> > To be fair, I think it's actually Rogers that blocks outbound port 25
>> > for Teksavvy's cable offering. Either through technical means, or
>> > through legal (contractual) means.  It's also the reason Teksavvy
>> > doesn't offer static IPs on straight non-MLPPP cable connections.
>> >
>> > The outbound port 25 block is still in place, as far as I can tell.
>> > Inbound port 25 works fine. So if you're OK with asymmetrical mail
>> > delivery you *can* run a mail server with Teksavvy.
>>
>> Oh! Cool. I didn't even think of the fact it might be a Cable only
>> restriction. Thanks for pointing that out.
>>
>> I wasn't being critical of that policy. T'was just FYI.
>>
>> Frankly, I think it generally has more benefit than harm for the bulk of
>> users on cable. But you can make arguments in many dimensions about it.
>>
>> (The other),
>> Bob.
>>
>>
>>
>>
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