Looks like Webiron is spamming again, and this time they're including a web bug in the mail to see if you've opened it:
https://www.webiron.com/images/misc/91.219.236.218/[email protected]/webiron-logo_abuse.png https://www.webiron.com/abuse_feed/[email protected] _______________________________________________ tor-relays mailing list [email protected] https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
![https://www.webiron.com/images/misc/91.219.236.218/[email protected]/webiron-logo_abuse.png](https://www.webiron.com/images/misc/91.219.236.218/ab...@1d4.us/webiron-logo_abuse.png){kind=link}