topic Re: Error message "550 5.7.1 Connection refused - blocked by Validity" in Email

Error message "550 5.7.1 Connection refused - blocked by Validity"

StarlightSurfer — Sun, 16 Nov 2025 13:02:24 GMT

Emails to #@tiscali.co.uk addresses (# = name) are returned with the message below.

Please request delisting from Validity so that my emails to tiscali are received by the addressees.

####

* #@tiscali.co.uk

Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** #@tiscali.co.uk ??:?? This message was created automatically by mail delivery software on the server .

Reporting-MTA: dns; avasout-peh-002 [212.159.14.18]
Received-From-MTA: dns; mail.enmail.co [91.204.208.8]
Arrival-Date: Sun, 16 Nov 2025 11:07:06 +0000

Final-recipient: rfc822; #@tiscali.co.uk
Diagnostic-Code: smtp; 550 5.7.1 Connection refused - [212.159.14.18] blocked by Validity - https://senderscore.org/blocklist-lookup/ - OXSEU001_102 - https://postmaster-oxseu.vadesecure.com/inbound_error_codes/#_102

Last-attempt-Date: Sun, 16 Nov 2025 11:07:06 +0000

####

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

StarlightSurfer — Sun, 16 Nov 2025 13:11:22 GMT

Also seeing

Connection refused - [84.93.230.250] blocked by Validity

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Townman — Sun, 16 Nov 2025 13:33:13 GMT

@dave / @plusnettony - in the absence of knowing a more appropriate name ...

avasout-peh-002.plus.net appears to be on four naughty steps concurrently!

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

mavison — Sat, 29 Nov 2025 19:29:41 GMT

Yet another 550 blocklisted error, this time to a hotmail.com address...

Reporting-MTA: dns; avasout-peh-001 [212.159.14.17] Received-From-MTA: dns; mail.enmail.co [91.204.208.8] Arrival-Date: Sat, 29 Nov 2025 18:23:23 +0000 Final-recipient: rfc822; xxxxxxxx@hotmail.com Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [212.159.14.17] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BC5D7A8DF8D60A] [CO1PEPF000044FC.namprd21.prod.outlook.com 2025-11-29T18:23:24.387Z 08DE2EBD47C6A865] Last-attempt-Date: Sat, 29 Nov 2025 18:23:24 +0000

Note this from a Force9 address which has NOT been migrated (due "from" 8th Dec).

Please can this be unblocked?

Diagnostic-Code: smtp; 550 5.7.1... ...part of their network is on our block list (S3150)

stuck — Sun, 30 Nov 2025 16:22:49 GMT

This just in from Microsoft:

Final-recipient: rfc822; [theCorrectNameHere]@hotmail.co.uk
Diagnostic-Code: smtp; 550 5.7.1 Unfortunately, messages from [84.93.230.235] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BC5D7E2465555F] [DU6PEPF0000B61B.eurprd02.prod.outlook.com 2025-11-30T15:20:55.179Z 08DE2EBF140FD79D]

The original outgoing message was 'To' [someone]@aol.com, 'Cc' [someoneElse]@[domainName].co.uk, [differentPersonAgain]@hotmail.co.uk

Only the @hotmail address generated a bounce, all the others were delivered.

@Townman, which Plusnet staff person needs to be informed of this latest problem with delivery to an MS address?

EDITED TO ADD:

The sending mailbox was a secondary one on my account. It's the same secondary account that's been receiving spam recently and which I griped about earlier today.

Re: Diagnostic-Code: smtp; 550 5.7.1... ...part of their network is on our block list (S3150)

Townman — Sun, 30 Nov 2025 17:01:34 GMT

Yet another thread is not overly helpful, staff are aware of this issue

https://community.plus.net/t5/Email/Server-bad-reputation-Outbound-Mail-Being-Blocked-IP-84-93-230/m-p/2029121
https://community.plus.net/t5/Email/Error-message-quot-550-5-7-1-Connection-refused-blocked-by/m-p/2028715#M55164
https://community.plus.net/t5/Email/SMTP-error-550-5-7-1-part-of-network-is-on-block-list/m-p/2026633#M54620

It is on the SU escalation list.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

plusnettony — Mon, 01 Dec 2025 13:24:43 GMT

if these 550's are what I think please check for virii and malware, and change your password as a precaution. I then need to know the email address you are sending FROM so I can check if there is something local that I can fix. PM me the from addresses rather than putting them in the public space. Thanks.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Wed, 03 Dec 2025 07:48:25 GMT

I've been having the same error message when I send to one particular contact and would like to send the details to you plusnettony but don't know how to pm you. Could you provide me with your address please?

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

jab1 — Wed, 03 Dec 2025 08:02:49 GMT

@Tykebike To send a PM, right click @plusnettony 's name at the side of his avatar - a new window with a 'send a message' option will open.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

plusnettony — Wed, 03 Dec 2025 11:49:01 GMT

I can't see anything that I can fix, but I've asked about. I'll PM when I hear back.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Wed, 03 Dec 2025 12:53:25 GMT

Thanks.

I'm having trouble logging into my account this morning and have changed my password but can't connect to webmail.

Waiting for Advisor to call.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

plusnettony — Wed, 03 Dec 2025 13:46:47 GMT

Where did you change your password (i.e. on which web site ? )

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Wed, 03 Dec 2025 14:18:01 GMT

It was on the Plusnet main website. I can log in there but cannot log in to webmail using it.

The advisor thinks that it is due to the migration process and advises me to keep checking by trying to access webmail peridoically throughout the day and then tomorrow morning when the migration should be nearer completion.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Townman — Wed, 03 Dec 2025 17:26:50 GMT

Which Email brand?

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Wed, 03 Dec 2025 17:44:07 GMT

It is Force9

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Townman — Wed, 03 Dec 2025 17:52:04 GMT

@Tykebike

If your email service has been migrated, changing passwords in the PLSUNET user portal is not going to get you anywhere. You need to manage your email service here - greenby.com

If this is a secondary email address for which you are having issues, then at the time of writing there are issues using the Plusnet webmail web page: login with an email address is not working - use account+mailbox as the user name or use the native Greenby webmail service - webmail.greenby.com

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Wed, 03 Dec 2025 18:03:08 GMT

How would I know if my email has been migrated as I've had no indication that it is immenent.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Townman — Wed, 03 Dec 2025 18:58:01 GMT

Force9 is well into the migration programme, however if you have a hosted domain name with the account, then you will not yet be on the schedule.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

plusnettony — Thu, 04 Dec 2025 10:13:54 GMT

If your portal profile details are correct, you have been migrated.

Re: Error message "550 5.7.1 Connection refused - blocked by Validity"

Tykebike — Fri, 05 Dec 2025 08:13:21 GMT

Thanks.

I'm still not receiving any emails on my username@trutta.f9.co.uk so I don't know whether I have received an email from Greenby or not. The last sync date was December 3rd.

I can log into the Plusnet Portal successfully but not to webmail on either the Plusnet or Greenby sites. On the Greenby site I have tried using my full email address and the password I use to access the Plusnet Portal but without success.

I have tried contacting the Plusnet help but when humans tried to contact me I have been out or my phone has been somewhere else. I will try again later this afternoon.