On Mon, Apr 27, 2015 at 12:36:19PM -0400, Charles Marcus wrote:
> On 4/6/2015 5:31 AM, Sebastian Nielsen wrote:
> > IMHO I find it better to only allow submission from trusted nets.
>
> So, you prefer to cripple your users by not allowing them to send email
> when outside the office?
This threa
On 4/6/2015 5:31 AM, Sebastian Nielsen wrote:
> IMHO I find it better to only allow submission from trusted nets.
So, you prefer to cripple your users by not allowing them to send email
when outside the office?
> Better to disable authentication completely, and completely disable mail
> submiss
k simply has to use their webmail, which does
> have more protections in form of captchas and such.
>
> *From:* Muhammad Yousuf Khan
> *Sent:* Monday, April 06, 2015 2:27 PM
> *To:* Peter
> *Cc:* Postfix users
> *Subject:* Re: port 25 465 and 587 confusion.
>
>
On 2015-04-06 14:27, Muhammad Yousuf Khan wrote:
in light of your above suggestions. i enabled
smtp inet n - - - - smtpd
#smtp inet n - - - 1 postscreen
#smtpd pass - - - - - smtpd
#dnsblo
from that particular ISP.
Users outside that network simply has to use their webmail, which does have
more protections in form of captchas and such.
From: Muhammad Yousuf Khan
Sent: Monday, April 06, 2015 2:27 PM
To: Peter
Cc: Postfix users
Subject: Re: port 25 465 and 587 confusion.
@P
@Peter
> Right, you really should not be allowing submission on port 25 at all.
>
>
> and is this segregation is a good thought of mine or practical?
>
> Yes
>
> > isn't 465 is useless and can i close this if yes then how?
>
> That depends on if you have users that have very old versions of Outloo
onday, April 06, 2015 11:18 AM
To: postfix-users@postfix.org
Subject: Re: port 25 465 and 587 confusion.
On 04/06/2015 08:05 PM, Muhammad Yousuf Khan wrote:
By Peter
-
What you should be, at the very least, encouraging is STARTTLS over
port
587. Whether you want to support some
On 04/06/2015 08:05 PM, Muhammad Yousuf Khan wrote:
> By Peter
> -
>
> What you should be, at the very least, encouraging is STARTTLS over port
> 587. Whether you want to support some very old Outlook clients and
> offer TLS wrappermode over 465 is up to you but it is unli
Thanks Noel and Peter i learned alot from both of your posts.
by Noel
For new installations, it is strongly recommended to require your
customers to use port 587 (or 465) and to disable AUTH on port 25.
can you please refer any document on this or any link. actually this is
what i al
On Sun, Apr 05, 2015 at 06:05:20PM -0500, Noel Jones wrote:
> Many sites enable port 465 as a convenience to their customers since
> it doesn't cost anything nor significantly affect security. Other
> refuse to enable port 465 for philosophical reasons.
This could change, there is early stage wo
On 04/06/2015 11:33 AM, Peter wrote:
> Thunderbird, for example, calls TLS wrappermode "TLS"
Correction: Thunderbird calls TLS wrappermode "SSL/TLS".
Peter
On 04/06/2015 05:42 AM, Muhammad Yousuf Khan wrote:
> port 25 is to send email b/w mailservers.
Correct.
> if my client(e.g. outlook)
> wants to send email it must use port 465 and 587
No, it *should* use 587. It is possible to set up port 25 for mail
submission but not recommended, that's simp
On 4/5/2015 12:42 PM, Muhammad Yousuf Khan wrote:
> Thanks Chirs,
>
> Please correct me if i am wrong. just sharing this if my concept is
> correct.
>
> port 25 is to send email b/w mailservers.
Yes, port 25 is required for MTA to MTA mail transfer.
Opportunistic STARTTLS should be enabled, but
Thanks Chirs,
Please correct me if i am wrong. just sharing this if my concept is correct.
port 25 is to send email b/w mailservers. if my client(e.g. outlook) wants
to send email it must use port 465 and 587 for security.
port 465 is for SSL Wraped SMTP port but can also be used with TLS howeve
On Sun, 5 Apr 2015 19:21:00 +0500
Muhammad Yousuf Khan wrote:
> now the confusion part is my concept. does port 25 and 465 work
> together like FTP. port 21 and 20. like 1 port is for negotiate and
> another port is for data?
Thank ${DIETY} that of all the common protocols nothing else is as
conv
Once upon a time, Muhammad Yousuf Khan said:
> now the confusion part is my concept. does port 25 and 465 work together
> like FTP. port 21 and 20. like 1 port is for negotiate and another port is
> for data?
Port 25 is tradtiotional SMTP, aimed at server<->server communications
now (and blocked
i am working on postfix and very new to it. just trying to learn but need
to clear my confusion.
i had read alot about all 3 ports and they are confusing me a bit now.
please help me to understand conceptually how things are working
differently on different ports.
my mail server is listening on po
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