Re: avoiding overload on port 587
- On 11/30/2012 5:24 PM, Reindl Harald wrote:
>Germany is not the U.S., and neither are Czechoslovakia. The preferred
> Am 01.12.2012 00:19, schrieb Stan Hoeppner:
>> On 11/30/2012 4:48 PM, Reindl Harald wrote:
>>> in the real world submission is useless if IMAP is down
>>> because the client will fail to store in "sent messages"
>> In the real world most road warriors use POP, not IMAP, and those with
>> consistent connectivity that do make use of IMAP do it via web mail. So
>> the "sent items" folder isn't an issue. Note the OP mentioned "laptop
>> users" as his submitters, not desktop users. "Laptop" implies roaming,
>> or he'd have used a different descriptive term.
> in the real world THSE DAYS especially road warriors use IMAP
> and not POP3! notebook, workstation, tablet, smartphone
protocol is dictated by availability of connectivity. There are large
swaths of the U.S., mainly the midwest, that have poor connectivity.
Road warriors traveling in these areas will prefer POP. I'm sure the
same is true in other parts of the world with sparse tower population.
> have fun with your cummunication as business user if you thinkFor many users having a universal "sent items" folder, or INBOX for that
> "sent items" folder isn't an issue
matter, is impractical. Most of the road warriors I know (and BTW "road
warrior" by definition is a traveling salesperson using a car and roads
for movement, not flights between cities) use separate mailboxes on
their smart phones and laptops. The smart phone account, maybe more
than one, is used for ad hoc communication with clients, friends,
family, etc, and sometimes home office personnel. The account used via
the laptop is for "official business" only. With such a setup a
"universal" sent items folder is unnecessary, and often unwanted. For
With many companies in the US, the company provides the laptop to the
road warrior, complete with company mailbox, AND spyware, keystroke
logger, etc. The road warrior provides his/her own phone, and uses a
separate public email provider (gmail) specifically to prevent "big
brother" from seeing all of his/her communications. Here the universal
sent items folder is absolutely NOT desirable, especially if it resides
on the company IMAP server, where all emails can be spied upon.
- On Tue, Dec 04, 2012 at 07:46:10AM -0600, /dev/rob0 wrote:
> On Tue, Dec 04, 2012 at 11:59:01PM +1300, Peter wrote:Or better yet: replace it with postscreen.
> > I would still also set up port 587 on the mail.example.com
> > IP as submission as well and try to encourage your users (at
> > least the ones you can) to use port 587 from now on.
> What I would do, on Linux with IPv4 only, is create the submission
> port and use an iptables redirect for the alternate IP address:
> # iptables -vt nat -A PREROUTING -p tcp --dport smtp -d \
> mail.example.com -j REDIRECT --to-port submission
> This saves the overhead (system and administrative) of running
> another smtpd on [mail.example.com]:25; he can leave his "smtp ...
> smtpd" service alone in master.cf.
> I should also add as a reply to Stan in the other subthread: lookTo clarify, I meant that if those Outlook Expresses are not yet
> above at the first quoted paragraph: "Outlook Expresses setup with
> ... default configuration."
> Yikes, bad news, very bad. If not doing content filtering nor
> policy limitation of submission now, he will be soon. And possibly
> losing his job in any case. Tomas is not in a good place right now.
compromised by malware, they will be, soon.
http://rob0.nodns4.us/ -- system administration and consulting
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