ip address blacklisted

[#1]

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?

[#2]

@gaskelldave What errors are you seeing when sending fails?

[#3]

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.

[#4]

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.

[#5]

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.

[#6]

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

[#7 · Accepted solution]

@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.

[#8]

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

[#9]

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.