Can't Send Email Smtp Is Locked With Cat

[matbkk]

Hi There,

At my office we are using 2 secure SMTP server based in Europe.

We are using outlook with the setting "this server require an authentification".

Since friday we can't send email !!!!

I have tried to telnet my both servers and it is not working (port 25,2525 and 587)

The problem comes by CAT because when I use Iphone internet connection with our computers the emails can go.

I called them and they said it is because of SPAM, means that our sending servers in Europe have blacklised our ip.

But my IP is not my IP !!!! I am maybe using an IP of a guy owho send 10000 spam yesterday !!!

If tryed to change my IP by restarting the router (thanks to the thai dynamic IP !!!).

The problem is the same.

Maybe all range of CAT ip are blacklisted 110.77.xxx.xxx ?

The only "solution" proposed by CAT "technicians" is to use their free SMTP relay2.cat.net.th .

Of course this is not a real solution. I don't know what to do !!!

Please help

Mat

[Chicog]

If CAT say blocklists are doing it, then the first thing to do is ask them what blocklists they are using. I say that because we had a similar problem when our ISP started using blocklists without telling us. We also had that cretin that runs Spamhaus who decided to block entire ISPs if they had a large segment of customers sending spam, irrespective if they had responsible customers like us who were clean as a whistle.

Had to get the EU to sort that one out.

[matbkk]

If CAT say blocklists are doing it, then the first thing to do is ask them what blocklists they are using. I say that because we had a similar problem when our ISP started using blocklists without telling us. We also had that cretin that runs Spamhaus who decided to block entire ISPs if they had a large segment of customers sending spam, irrespective if they had responsible customers like us who were clean as a whistle.

Had to get the EU to sort that one out.

It seems that almost all ip (i have tryed random) from CAT are locked by Barracuda and Spamhaus. I can fight with them to get unlocked my IP but tomorrow my IP will be changed automatically and I will have to start again.

[NHJ]

it's like that all over the world, usually smpt port is blocked for end users.

[innerspace]

If CAT say blocklists are doing it, then the first thing to do is ask them what blocklists they are using. I say that because we had a similar problem when our ISP started using blocklists without telling us. We also had that cretin that runs Spamhaus who decided to block entire ISPs if they had a large segment of customers sending spam, irrespective if they had responsible customers like us who were clean as a whistle.

 

Had to get the EU to sort that one out.

It seems that almost all ip (i have tryed random) from CAT are locked by Barracuda and Spamhaus. I can fight with them to get unlocked my IP but tomorrow my IP will be changed automatically and I will have to start again.

Unless you are running a mail server from your home this wont be an issue.

Your own mail server should allow your local ip even if spam blacklisted since you authenticated by password.

The remote server will mainly check your mail servers static ip since that is the middleman.

It is rare that remote mail servers reject from the initial senders ip due to the dynamic nature of home ips.

If your mail servers ip is blocked then big problems.

If your home ip is sending email directly often a sign of malware based spam.

Sent from my GT-N7100 using Thaivisa Connect Thailand mobile app

[innerspace]

Hi There,

 

At my office we are using 2 secure SMTP server based in Europe.

We are using outlook with the setting "this server require an authentification".

 

Since friday we can't send email !!!!

I have tried to telnet my both servers and it is not working (port 25,2525 and 587)

 

The problem comes by CAT because when I use Iphone internet connection with our computers the emails can go.

 

I called them and they said it is because of SPAM, means that our sending servers in Europe have blacklised  our ip.

But my IP is not my IP !!!! I am maybe using an IP of a guy owho send 10000 spam yesterday !!!

If tryed to change my IP by restarting the router (thanks to the thai dynamic IP !!!).

The problem is the same.

 

Maybe all range of CAT ip are blacklisted 110.77.xxx.xxx ?

 

The only "solution" proposed by CAT "technicians" is to use their free SMTP relay2.cat.net.th .

 

Of course this is not a real solution. I don't know what to do !!!

 

Please help

Mat

Do you own and run the servers or just use them?

Can you access the servers on other ports?

Receiving email?

Hot about port 465. Smtp over SSL?

If you cant access the servers in any way then the servers are blocking you.

If you cant access any other mail servers on the ports tried then cat are blocking you.

Can you autenticate with the servers?

Very rare for mail servers to block ips due to spam before allowing an authentication attempt...unless a suspected hacking attempt has been detected. Any failed logins with wrong passwords?

Sent from my GT-N7100 using Thaivisa Connect Thailand mobile app