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asterisk.org at sedwar...
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 Posted: Wed Jun 03, 2015 11:43 am Post subject: [asterisk-users] sedwards@sedwards.com causes me to be knock |
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"sedwards@sedwards.com causes me to be knocked off the list"
I feel so powerful 
On Wed, 3 Jun 2015, Giles Coochey wrote:
| Quote: | Someone on this list uses the address @sedwards.com
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That would be me. Although, I prefer to use asterisk.org@sedwards.com for
'list related' emails.
| Quote: | I doubt this is their actual email address as there is no MX record for
sedwards.com and I can't find registration for their domain either.
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It is, there is, and please look harder.
| Quote: | Part of my mail servers reject these emails because they cannot be replied
to, or are likely to be spam.
Every so often I get a mail from the list management to say that I've been
unsubscribed because of excessive bounces and it takes a single click to
re-register.
It's a bit of a niggle for me. What do you think I should do? Change my
servers so that I don't check sender domains?
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DNS and email servers are not my area of expertise, so if you think I've
misconfigured something on my side, please let me know.
--
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST
Newline Fax: +1-760-731-3000
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jcass78 at gmail.com
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| Posted: Wed Jun 03, 2015 11:48 am Post subject: [asterisk-users] sedwards@sedwards.com causes me to be knock |
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I agree with Doug, everything looks legit for sedwards.com from my point of view. Giles, maybe there's something wrong with the DNS server you're using?
jcass78@gmail.com (jcass78@gmail.com)
On Wed, Jun 3, 2015 at 11:01 AM, Giles Coochey <giles@coochey.net (giles@coochey.net)> wrote:
| Quote: | Someone on this list uses the address @sedwards.com
I doubt this is their actual email address as there is no MX record for sedwards.com and I can't find registration for their domain either.
Part of my mail servers reject these emails because they cannot be replied to, or are likely to be spam.
Every so often I get a mail from the list management to say that I've been unsubscribed because of excessive bounces and it takes a single click to re-register.
It's a bit of a niggle for me. What do you think I should do? Change my servers so that I don't check sender domains?
--
Regards,
Giles Coochey, CCNP, CCNA, CCNAS
NetSecSpec Ltd
[url=tel:%2B44%20%280%29%208444%20780677]+44 (0) 8444 780677[/url]
[url=tel:%2B44%20%280%29%207584%20634135]+44 (0) 7584 634135[/url]
http://www.coochey.net
http://www.netsecspec.co.uk
giles@coochey.net (giles@coochey.net)
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dplatt at radagast.org
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| Posted: Wed Jun 03, 2015 12:43 pm Post subject: [asterisk-users] sedwards@sedwards.com causes me to be knock |
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| Quote: | Someone on this list uses the address @sedwards.com
I doubt this is their actual email address as there is no MX record for
sedwards.com and I can't find registration for their domain either.
Part of my mail servers reject these emails because they cannot be
replied to, or are likely to be spam.
Every so often I get a mail from the list management to say that I've
been unsubscribed because of excessive bounces and it takes a single
click to re-register.
It's a bit of a niggle for me. What do you think I should do? Change my
servers so that I don't check sender domains?
|
If the SMTP session is saying "MAIL FROM: <xxxxx@sedwards.com>", and if
"sedwards.com" has no MX or A addresses on file with DNS, then I think
it's appropriate to reject the mail at that stage, either permanently
or temporarily. The latter is probably better in case there's a
transient DNS problem. Your server should send an error message in
response to the "MAIL FROM" command.
The Asterisk mailing list servers should *not* be forwarding messages to
list subscribers in this way. Most of the big mail providers are now
performing SPF (or similar) validation on the "MAIL FROM" addresses, and
will reject a lot of mail which is "reflected" through mailing-list servers.
Current practice is for mailing-list servers to "rewrite" the sender
address in the envelope (to a form which identifies their own domain as
the intermediate relay/sender) or to just use an address such as
"asterisk-users@list.digium.com" as the MAIL FROM address.
Now... if you're digging into the message headers themselves (e.g.
looking at the "From: " header) and rejecting the mail because the
address therein isn't legitimate... that's a different issue and a
bigger problem. Your mail server can't do this during the initial SMTP
handshake... only after it accepts the entire message from the sending
system. This creates an anomalous situation, because your server
provisionally accepted the message (by saying OK to the MAIL FROM, RCPT
TO, and DATA requests from the sender), and then rejected the message as
undeliverable "at the last moment". Not a good thing, according to the
SMTP spec, and it's not surprising that some servers will consider this
a practice which justifies blocking further deliveries to your system.
In this case, you'd be better off accepting the mail normally via SMTP,
using your spam filter to "tag" it with a "suspicious" label, and the
filing it in a "spam" folder or just discarding it after reception.
From the point of view of the sending system, it will have been accepted
normally (rather than rejected or bounced) .
One thing you definitely should *NOT* ever do, is accept a mail message
via SMTP (saying "OK"), determine that you think it's spam, and then
have your mail server "mail back" a "rejected" bounce message to the
sender. This is bad, bad, bad. It causes "back-scatter" - if mail is
sent with a forged sender address (which is quite common) the poor
schlub whose address was stolen for this purpose is likely to get a
reject message for every copy of the forged mail. This can put a
horrible burden on the victim's mail server.
--
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New to Asterisk? Join us for a live introductory webinar every Thurs:
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