topic Re: ip address blacklisted in Email

ip address blacklisted

gaskelldave — Wed, 19 Apr 2023 09:06:49 GMT

For the past couple of weeks I've been unable to send emails despite using standard email settings and a new Plusnet router. After spending far too much time trying to find out how to get the problem sorted, I've done a few tests and I've managed to occasionally get it to work by using a VPN so that suggests it's an IP address issue. I've found another thread on here and, as a result of that, used telnet with "telnet relay.plus.net 25" to discover that my ip address has been "blacklisted by local policy".

How do I get this resolved?

Re: ip address blacklisted

jab1 — Wed, 19 Apr 2023 10:08:06 GMT

@gaskelldave What errors are you seeing when sending fails?

Re: ip address blacklisted

gaskelldave — Wed, 19 Apr 2023 10:30:34 GMT

On my laptop, using Outlook, I get the popup that appears when unable to connect to relay.plus.net. On Android tablet on a mail app it just sits in Outbox and just says "Failed". On my Android phone it says "Failed due to permanent error". None very helpful. It was when using telnet I got the blacklisted response.

Re: ip address blacklisted

jab1 — Wed, 19 Apr 2023 10:33:41 GMT

OK. I'll tag @Townman in this - he is the expert. As regards the 'blacklisting', that is normal (I think) but again I'll leave confirmation of that to the expert.

Re: ip address blacklisted

pjmarsh — Wed, 19 Apr 2023 10:42:51 GMT

I think there was a similar case not too long ago which was down to something on the users system sending excessive amounts of emails. I think in that case they where running a webserver with the option to register an account which sent an email to the address being used, and that was being abused. Other reasons I could think of is a virus/malware or you purposefully sending a very large number of emails.

It may be possible, if you're not on a static IP, that a previous "owner" of your current IP abused it and it got blacklisted before it was assigned to you.

Re: ip address blacklisted

jab1 — Wed, 19 Apr 2023 11:14:29 GMT

Another thought. Which port are you using to attempt the send - 25 or 587?

Re: ip address blacklisted

Townman — Wed, 19 Apr 2023 11:24:14 GMT

@jab1

In this context port number will have no bearing.

@pjmarsh 's observations would be the most appropriate given that the user can send emails when connected via VPN.

If the user is not on a static IP, turning off their router for 90 minutes might result in a different IP address being assigned.

Re: ip address blacklisted

jab1 — Wed, 19 Apr 2023 11:32:04 GMT

@Townman OK -'twas only a thought, and thanks for popping in. 😀

Re: ip address blacklisted

gaskelldave — Wed, 19 Apr 2023 15:54:02 GMT

Turned my router off for a couple of hours and, on powering things back up again I've been assigned a different ip address and emails have started flowing properly again.

Many thanks everyone for chipping in to help me get this sorted. Appreciated.