(host is blacklisted) Error Number: 0x800CCC79

[Guest]

First of all: I'm using Outlook Express, maybe this is not the right place to bring this up, and if so, I would apreciate if someone could direct me to the right spot.

I have used Outlook Express for years, and never had any major problems with it. 7 hours ago I could not send emails from my domain account any more, while using other mail domains configured in Outlook worked without any problem. The following message is given as a reason:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '(e-mail address removed)'. Subject 'Re: XXXX', Account: 'mail.XXXXX.com', Server: 'mail.XXXX.com', Protocol: SMTP, Server Response: '550 mail from XXX.XXX.XXX.XXX rejected: administrative prohibition (host is blacklisted)', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

I can receive mail there on all accounts in OE, and from my web based mail client on my domain I can send and receive mails... so the problem is not on the end of my domain host.

I have tired to disable both firewall and antivirus software, but it makes no difference. Could it be my ISP blocking me? I know that can happen when a user's computer is infected by virus, or if abusive behavior has been reported. I have no virus in the system (I am fully protected, and have also scanned the computer online today to make sure that I was clean). And abusive behavior.... I am a little too old for such childish things.

After contacting my ISP, they deny flatly there is any error on their side.... and that I am not blacklisted by them.

Anyone that can confirm or correct my suspicions is welcome to advice me. This is pretty important since it is my business e-mail.... and managing things from the web based mail is a slow process.

Thanks in advance,

Trausti

 

[Vanguard]

First of all: I'm using Outlook Express, maybe this is not the right
place to bring this up, and if so, I would apreciate if someone could
direct me to the right spot.

I have used Outlook Express for years, and never had any major
problems with it. 7 hours ago I could not send emails from my domain
account any more, while using other mail domains configured in
Outlook worked without any problem. The following message is given
as a reason:

The message could not be sent because one of the recipients was
rejected by the server. The rejected e-mail address was
'(e-mail address removed)'. Subject 'Re: XXXX', Account: 'mail.XXXXX.com',
Server: 'mail.XXXX.com', Protocol: SMTP, Server Response: '550 mail
from XXX.XXX.XXX.XXX rejected: administrative prohibition (host is
blacklisted)', Port: 25, Secure(SSL): No, Server Error: 550, Error
Number: 0x800CCC79

I can receive mail there on all accounts in OE, and from my web based
mail client on my domain I can send and receive mails... so the
problem is not on the end of my domain host.

I have tired to disable both firewall and antivirus software, but it
makes no difference. Could it be my ISP blocking me? I know that
can happen when a user's computer is infected by virus, or if abusive
behavior has been reported. I have no virus in the system (I am
fully protected, and have also scanned the computer online today to
make sure that I was clean). And abusive behavior.... I am a little
too old for such childish things.

After contacting my ISP, they deny flatly there is any error on their
side.... and that I am not blacklisted by them.

Anyone that can confirm or correct my suspicions is welcome to advice
me. This is pretty important since it is my business e-mail.... and
managing things from the web based mail is a slow process.

Thanks in advance,

Trausti

Your ISP has finally decided to clean up their act, probably because
they have been blacklist by DNSBLs (DNS blacklists) that are used by
several anti-spam products which e-mails from their domain
undeliverable, hidden, or auto-deleted. Apparently they finally chose
to bar the relay of SMTP traffic across their domain or force off-domain
users to authenticate to their mail servers.

Firstly make sure you are using the SMTP server of the domain to which
you are connecting. If you are connecting to myisp.com then use
smtp.myisp.com (or whatever they name their SMTP host). Don't be
connecting to otherisp.com and expecting to use smtp.myisp.com unless
otherisp.com allows relaying of SMTP traffic across their domain.

Secondly, if you are travelling and want to use your ISP's SMTP server
instead of some off-site dial-up service's server, make sure you are
authenticating to your ISP's SMTP server. Authentication is under the
advanced settings for your e-mail account in Outlook. You authenticated
to the off-site service to which you connect, and since that is not your
ISP then your ISP has no clue about who you are, so you need to provide
your username and password to their SMTP server to prove you have rights
to use their service. Also, some ISPs will also use non-standard port
numbers, SSL might need to be enabled, and maybe even SPA (secure
password authentication) might need to be enabled when connecting to an
SMTP server from off its domain. You'll have to check with your ISP as
to whether or not they allow off-domain access to their SMTP server and,
if so, what settings you need to configure in your e-mail account to
access their server from someone else's domain. If they require
non-standard ports when off-domain, that account won't work when you
are on-domain, so you'll need one "local" or on-domain account and
another "remote" or off-domain account to the same server but using
different ports, SSL, and/or SPA. This is something your ISP can
elucidate in detail.

 

[Guest]

It was all to simple..... nothing more than a ID 10 T failure. Both from my side, and the DSL modem.

All I had to do, was to turn off the DSL modem, unplug the electrical supply to it, and reconnect it 5 minutes later. I had unplugged it earlier today for no more than a minute, and that did not do the trick.

Trausti

 

[Guest]

I'm getting this same error message. My ISP says it cannot help me. Any suggestions?

----- Vanguard wrote: -----

First of all: I'm using Outlook Express, maybe this is not the right
place to bring this up, and if so, I would apreciate if someone could
direct me to the right spot.
problems with it. 7 hours ago I could not send emails from my domain
account any more, while using other mail domains configured in
Outlook worked without any problem. The following message is given
as a reason:
rejected by the server. The rejected e-mail address was
'(e-mail address removed)'. Subject 'Re: XXXX', Account: 'mail.XXXXX.com',
Server: 'mail.XXXX.com', Protocol: SMTP, Server Response: '550 mail
from XXX.XXX.XXX.XXX rejected: administrative prohibition (host is
blacklisted)', Port: 25, Secure(SSL): No, Server Error: 550, Error
Number: 0x800CCC79
mail client on my domain I can send and receive mails... so the
problem is not on the end of my domain host.
makes no difference. Could it be my ISP blocking me? I know that
can happen when a user's computer is infected by virus, or if abusive
behavior has been reported. I have no virus in the system (I am
fully protected, and have also scanned the computer online today to
make sure that I was clean). And abusive behavior.... I am a little
too old for such childish things.
side.... and that I am not blacklisted by them.
me. This is pretty important since it is my business e-mail.... and
managing things from the web based mail is a slow process.

Your ISP has finally decided to clean up their act, probably because
they have been blacklist by DNSBLs (DNS blacklists) that are used by
several anti-spam products which e-mails from their domain
undeliverable, hidden, or auto-deleted. Apparently they finally chose
to bar the relay of SMTP traffic across their domain or force off-domain
users to authenticate to their mail servers.

Firstly make sure you are using the SMTP server of the domain to which
you are connecting. If you are connecting to myisp.com then use
smtp.myisp.com (or whatever they name their SMTP host). Don't be
connecting to otherisp.com and expecting to use smtp.myisp.com unless
otherisp.com allows relaying of SMTP traffic across their domain.

Secondly, if you are travelling and want to use your ISP's SMTP server
instead of some off-site dial-up service's server, make sure you are
authenticating to your ISP's SMTP server. Authentication is under the
advanced settings for your e-mail account in Outlook. You authenticated
to the off-site service to which you connect, and since that is not your
ISP then your ISP has no clue about who you are, so you need to provide
your username and password to their SMTP server to prove you have rights
to use their service. Also, some ISPs will also use non-standard port
numbers, SSL might need to be enabled, and maybe even SPA (secure
password authentication) might need to be enabled when connecting to an
SMTP server from off its domain. You'll have to check with your ISP as
to whether or not they allow off-domain access to their SMTP server and,
if so, what settings you need to configure in your e-mail account to
access their server from someone else's domain. If they require
non-standard ports when off-domain, that account won't work when you
are on-domain, so you'll need one "local" or on-domain account and
another "remote" or off-domain account to the same server but using
different ports, SSL, and/or SPA. This is something your ISP can
elucidate in detail.