Outgoing emails blocked

SiliconChip

A problem has started today with emails failing to go out from my Windows 11 laptop through my Three broadband hub (ZTE MC888), which appears to be because my IP address has been put on the CSS blocklist (see https://check.spamhaus.org/listed/?searchterm= for more details). 

Any thoughts on what I can do to get it unblocked?

(IP address removed by Forum Team)

Neil_Jones

Turn your router off for ten minutes, then on again. and it should get a new address.

booneruk

SiliconChip said:

A problem has started today with emails failing to go out from my Windows 11 laptop through my Three broadband hub (ZTE MC888), which appears to be because my IP address has been put on the CSS blocklist (see https://check.spamhaus.org/listed/?searchterm= for more details). 

Any thoughts on what I can do to get it unblocked?

(IP address removed by Forum Team)

I presume you're assigned a dynamic IP address by your ISP, meaning you could land one that a previous user has spammed heavily from. As the message above, turning your router off and on might force a new IP address to be assigned to you.

What service do you use to send emails through? Mine is IONOS I had to add some DNS records lately to get past some spam filters. I can google "IONOS SPF records" right now and find the instructions I followed.

I'm hopeful you can do something about this, but it may end up being something you need your ISP or Email provider to resolve.

SiliconChip

Neil_Jones said:

Turn your router off for ten minutes, then on again. and it should get a new address.

Thanks, I'll give that a try and let you know if it works.

SiliconChip

booneruk said:

SiliconChip said:

A problem has started today with emails failing to go out from my Windows 11 laptop through my Three broadband hub (ZTE MC888), which appears to be because my IP address has been put on the CSS blocklist (see https://check.spamhaus.org/listed/?searchterm= for more details). 

Any thoughts on what I can do to get it unblocked?

(IP address removed by Forum Team)

I presume you're assigned a dynamic IP address by your ISP, meaning you could land one that a previous user has spammed heavily from. As the message above, turning your router off and on might force a new IP address to be assigned to you.

What service do you use to send emails through? Mine is IONOS I had to add some DNS records lately to get past some spam filters. I can google "IONOS SPF records" right now and find the instructions I followed.

I'm hopeful you can do something about this, but it may end up being something you need your ISP or Email provider to resolve.

I use Fasthosts, if I log on to their webmail I can send emails fine so I think it's more likely to be a ISP issue than an email host. I have posted a question on the Three community forum but there haven't been any replies yet. Hopefully turn it off and on will work

SiliconChip

Fortunately turn it off and on again has worked, thanks to both @Neil_Jones and @booneruk for the help.

GDB2222

SiliconChip said:

Fortunately turn it off and on again has worked, thanks to both @Neil_Jones and @booneruk for the help.

It works over 90% of the time, whatever the fault is!

SiliconChip

I've had to resurrect this as while the stop/wait/start method worked a couple of times it's now not working, I'm getting a new IP assigned but outgoing emails are still being blocked.

The technical information provided by Spamhaus suggests that blocking port 25 is a good first step. My SMTP connection (Thunderbird to Fasthosts) uses port 465, so blocking 25 shouldn't impact my own emails, but I'm unsure how to do it. Logging on to my ZTE MC888 hub I can see the firewall options, which includes Port Filtering, expanding that option shows MAC/IP/Port Filtering set to Disable, if I click the Enable button it adds Default Policy set to Accepted, with an alternative of Dropped. To accept updated settings there's an Apply button, and if I click that it then gives me a page of Filtering Settings, as below, but I've no idea what to add in order to block 25 (if this is even the right place to do it!).

bob2302

Blocking port 25 is advice to ISPs, not end users.  If you do it, it wont make any difference unless your device is infected and actually spamming.

IIRC CSS is a snowshoe list, it's not actually supposed to contain any dynamic pool addresses, are you sure it's your address that's listed and not some upstream server?