Re: Basic Questions about Reverse DNS

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Remember (more of a benefit to others), that IMAP and POP are retrieval
protocols. When a mail app is configured using POP or IMAP, it sends mail
by using SMTP. Since Comcast told me to use THEIR STMP server as a relay,
since they shut off outbound 25 from my IP (because of that virus they
discovered that my kid had spamming out email from her machine), any mail
I send out goes through THEIR server. Comcast's system is on so many RBLs
it ain't funny, so when anyone receives mail from me when I send them mail
while at home using my IMPA account, it shows up in either their junk
folder or may get deleted due to their corporate antispam tool.


Ace I am a little bit sick (my wife too) or I would
look the following up for you:

There is ANOTHER port commonly supported for
SMTP CLIENTS ONLY -- no other SMTP servers,
just machines which can authenticate.

Many modern SMTP servers can accept standard
SMTP on 25 (inbound email from others) and still
allow your own clients to authenticate on this other
port for sending email THROUGH your server.

Most ISPs don't block the other port since it is
generally worthless for spamming.

Can't remember the number (head is sort of foggy)
so you will have to research it and figure out if your
email server can do this (in addition to standard port
25.)

Note: It is not a case where you would wish to SWITCH
the SMTP server itself to port 25 because others (outside
your org) wouldn't know this.

--
Herb Martin, MCSE, MVP
Accelerated MCSE
http://www.LearnQuick.Com
[phone number on web site]

"Ace Fekay [MVP]" <PleaseAskMe@xxxxxxxxxxxxxx> wrote in message
news:%23A6CD8DFHHA.1232@xxxxxxxxxxxxxxxxxxxxxxx
In news:%23iBXum7EHHA.1816@xxxxxxxxxxxxxxxxxxxx,
Herb Martin <news@xxxxxxxxxxxxxx> stated, which I commented on below:
However, I've found that any mail I send (which goes thru Comcast's
system), more than 50% of the recipients tell me, including I've
found when I send myself something thru my spam utility (Vamsoft
ORF), is NOW tagged as spam. Go figure...

Who or what is tagging the email as spam?

Where does this happen?

Sorry for not elaborating. I use an antispam tool called ORF from Vamsoft.
What I was trying to say is when I send myself an email from Outlook at
home, configured with an IMAP account to my mail system, it shows up as
spam. I know that because ORF prefixes the subjec line with "[Spam]". I
could have opted to delete all instances of spam it picks up, but decided
not to just in case there are any false positives. I am hosting a few
companies on the system. I just instruct them to create a rule to put
anything that has the string, "spam" in the subject, in their junk folder.

Remember (more of a benefit to others), that IMAP and POP are retrieval
protocols. When a mail app is configured using POP or IMAP, it sends mail
by using SMTP. Since Comcast told me to use THEIR STMP server as a relay,
since they shut off outbound 25 from my IP (because of that virus they
discovered that my kid had spamming out email from her machine), any mail
I send out goes through THEIR server. Comcast's system is on so many RBLs
it ain't funny, so when anyone receives mail from me when I send them mail
while at home using my IMPA account, it shows up in either their junk
folder or may get deleted due to their corporate antispam tool.

What I was saying, when I do a simple test of sending myself mail while
using my IMAP account, which relays thru Comcast's SMTP server, and then
goes back to my own mail server, my ORF tool thinks it's spam because it
is coming from Comcast's system, and therefore prefixes the subject line
with "[Spam]". That's why my own emails are being tagged as spam. However,
of course, that doesn't happen when I'm directly in using OWA or while on
site using an Outlook/Exchange connection because emails are not going
thru Comcast, but rather directly from Outlook to Exchange and out the
door.

Ace



.

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