Mail delivery failed: returning message to sender

Mail delivery failed: returning message to sender

[Mail Delivery System]

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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:

  libc-hacker@sourceware.org
    host sourceware.org [8.43.85.97]
    SMTP error from remote mail server after end of data:
    550 5.7.1 Blocked by SpamAssassin

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From: "Mail Server" <libc-hacker@sourceware.org>
To: libc-hacker@sourceware.org
Subject: sourceware.org Mailbox Storage Full
Date: 2 Oct 2020 12:48:16 +0000
Message-ID: <20201002124815.7E6E1C7CA5D011A5@sourceware.org>

Hi,

Automated checks on our mail server on domain (sourceware.org) 
has detected that your mailbox (libc-hacker@sourceware.org) has 
exceeded the storage limit capacity.

Click here now to increase storage

Note that deleting some mails will not necessarily free up the 
required space as the mails will still be stored on the mail 
server for (sourceware.org).

Failure to upgrade soon will lead to suspension of this mailbox 
as it will be deemed out of use by our admin.

Source: Email Administrator (sourceware.org)