Hi,

Sometimes I have users send me email from bluewin. Those emails can be significantly delayed. An example just came in this morning:

Received: from quar.lb.bluewin.ch ([195.186.123.234])
	by vimdzmsp-sfwd04.bluewin.ch Swisscom AG with ESMTP
	id 9FbplVkv74QBH9Fc9l0UVW; Tue, 09 Feb 2021 00:06:41 +0100
Received: from vimdzmsp-sfwd04.bluewin.ch ([195.186.227.132])
	by vimdzmsp-quar01.bluewin.ch Swisscom AG with SMTP
	id 82c8lv39dIuiP82c8lqzVg; Fri, 05 Feb 2021 16:01:41 +0100

Delayed from Friday until Tuesday by quar.lb.bluewin.ch. Quar seems to be short for "quarantine".

The sending user had no idea that this happened.

I previously asked in the Swisscom community about this and they confirmed that this happens when the server suspects it's spam. The questions I have now though are:

- How is the sending user supposed to know that this happened?

- It seems that they really expect the sending user to call their support line and ask the mail to be released (!).

- How did the mail get released in this case? The length of the quarantine seems to change and you could suspect that it's a human looking through those emails.

regards,

Maxim