The latest emails from the list are all falling foul of Fastmail’s spam checking: X-Spam-score: 11.1 X-Spam-hits: BAYES_00 -1.9, DCC_REPUT_13_19 -0.1, HTML_MESSAGE 0.001, MAILING_LIST_MULTI -1, ME_HAS_VSSU 0.001, ME_SENDERREP_NEUTRAL 0.001, RCVD_IN_SBL_CSS 3, RCVD_IN_ZEN_LASTEXTERNAL 8, SH_BODYURI_REVERSE_CSS 3, SPF_HELO_NONE 0.001, SPF_PASS -0.001, URIBL_CSS_A 0.1, LANGUAGES en, BAYES_USED user, SA_VERSION 3.4.6 X-Spam-source: IP='85.119.80.246', Host='lists0.bitfolk.com', Country='GB', FromHeader='com', MailFrom=‘com' It appears to be because 85.119.80.246 is in the Spamhaus CSS block list: https://check.spamhaus.org/listed/?searchterm=85.119.80.246 Looks like you can request removal on that page. Cheers, Mike