Outlook Express 6 on WinXP and this list

[Vangelis forthnet]

On Wed Apr 6 01:31:11 BST 2016, I wrote: 

>> Also, I was e-mailed in private by member "d4x"
>> (who has trouble sending e-mails directly to the list)
> (snip)
> I have advised "d4x" to try third party mail clients 
> on XP to see if that fixes his issue, have yet to hear back. 

 ... d4x GiP user resides in the UK, his ISP is TalkTalk, 
his OS is Windows XP.
 In a follow-up personal exchange, he assured me that he tries 
to post in plain-text format without performing thread hi-jacking 
(by altering existing thread title etc). 

In his most recent test, he tried Thunderbird (still supported on XP), 
he went to my following list post:
http://lists.infradead.org/pipermail/get_iplayer/2016-April/008850.html
and:

> I sent it using the Mailto: link at the top of your post

Read the rest in his own words:

> Just tried posting to the list using Thunderbird 
> but got the same bounce response as in OE6
> 
> <<<<<<<<<<<<<<<<<<<<<<<<<<
> This is an automatically generated Delivery Status Notification.      
> 
> Delivery to the following recipients was aborted after 25 second(s):
> 
>  * get_iplayer at lists.infradead.org
> 
> Reason: The following message to get_iplayer at lists.infradead.org was 
> undeliverable.The reason for the problem:  550-Verification failed 
> for <e-mail address concealed>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>
> (snip)
> I'm not sure if the list is the best place to sort it out, 
> that's meant to be for discussions about the usage of GiP. 
> If I need to, I'll sort out a different email address.

I won't post d4x's e-mail address in this public list 
(at least not without his prior consent), but should 
the list maintainer be inclined to debug this, 
I'll send d4x's infringing e-mail address to him directly, 
and he could then follow this further with d4x in private...

Best regards, 
Vangelis.