nicolas.s-dev at laposte.net refuses mail {for Nicolas Sebrecht only}

[ael]

Apologies for using this list for this, but I don't seem to be able to
email Nicolas directly. Maybe this is an anti-spam measure?

Nicolas, should my attempts to reply to you be rejected (has happened
several times in the last few days) as below?

> This message was created automatically by mail delivery software.
> 
> A message that you sent could not be delivered to one or more of its
> recipients. This is a permanent error. The following address(es) failed:
> 
>   nicolas.s-dev at laposte.net
>     host smtpz4.laposte.net [194.117.213.1]
>     SMTP error from remote mail server after end of data:
>     550 5.5.0 Service refuse. Veuillez essayer plus tard. service refused, please try later. LPN006_510

> Reporting-MTA: dns; relay11.mail.ox.ac.uk
> 
> Action: failed
> Final-Recipient: rfc822;nicolas.s-dev at laposte.net
> Status: 5.0.0
> Remote-MTA: dns; smtpz4.laposte.net
> Diagnostic-Code: smtp; 550 5.5.0 Service refuse. Veuillez essayer plus tard. service refused, please try later. LPN006_510

> Date: Tue, 5 Sep 2017 13:39:00 +0100
> From: ael <law_ence.dev at ntlworld.com>
> To: Nicolas Sebrecht <nicolas.s-dev at laposte.net>
> Subject: Re: openssl/libssl1 in Debian now blocks offlineimap?
> User-Agent: NeoMutt/20170609 (1.8.3)

  [snip]

ael