On 04/10/2015 10:03 AM, Tim wrote:
Allegedly, on or about 09 April 2015, Rick Stevens sent:
Many ISPs block SMTP traffic TO their end users. Most also block
outgoing SMTP traffic FROM their end users _unless_ it's going to the
ISP's mail servers (this is to prevent end users from becoming spam
farms). Assuming your ISP permits bi-directional SMTP traffic, here
are things to look at:
And many other ISPs (i.e. not your own) may refuse to send mail through
to client IP addresses.
Your own ISP may refuse to forward SMTP to you (as I said above). I
don't know of many ISPs that won't send mail to a specific IP outside
their address space unless they query a blacklist. They really would
have no way of knowing what is a client IP and what isn't unless they
infer it from doing a reverse DNS query and getting results like
"dsl.www.xx.yy.zz.ispname.com" or something and assume that's an end
user IP because of the "dsl" in the reverse resolution or because the
reverse name doesn't match an MX record for the domain (not uncommon).
Your ISP has a range of addresses, some of them are allocated to their
own services, the majority are allocated to their customers. There may
be a split of serving-allowed business IPs and serving-disallowed
general customer IPs. The customer range of addresses may be
blacklisted, world-wide (which may be just precautionary, or it could be
in response to prior spam from those IP - in which case you will have
difficulties in reversing such actions).
Yup. While the intent of the spam police is good, their protest
resolution generally leads much to be desired. Not to mention names,
but one based on a German domicile for canned meat products was one of
the absolute worst. I have no idea how they are now, but they used to
be awful.
The Internet is a wild and wooly beastie!
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- I won't rise to the occasion, but I'll slide over to it. -
----------------------------------------------------------------------
--
users mailing list
users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe or change subscription options:
https://admin.fedoraproject.org/mailman/listinfo/users
Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
Have a question? Ask away: http://ask.fedoraproject.org
