Public bug reported: Mailman often do not send emails to all addressees. Usually a single recipient is lost, but sometimes 2 or 3. there is a fragment from mailmans smtp log file, recipient count randomly changed from 28 to 27. Mar 15 08:57:31 2018 (60449) <20180315065723.E829F124FB4@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.395 seconds Mar 15 08:58:17 2018 (60449) <20180315065811.D36F512506A@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.167 seconds Mar 15 09:09:04 2018 (60449) <20180315070859.42309125071@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.148 seconds Mar 15 09:13:47 2018 (60449) <20180315071331.34C3B12506A@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.151 seconds Mar 15 09:14:59 2018 (60449) <20180315071453.7FC1412506A@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.082 seconds Mar 15 09:15:54 2018 (60449) <20180315071548.217D912505D@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.249 seconds Mar 15 09:16:59 2018 (60449) <20180315071623.0193912506A@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.131 seconds Mar 15 09:17:05 2018 (60449) <20180315071629.1FD64124FC5@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.143 seconds Mar 15 09:17:27 2018 (60449) <20180315071645.194B212505A@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.093 seconds Mar 15 09:17:56 2018 (60449) <20180315071702.004EA12505A@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.211 seconds Mar 15 09:18:11 2018 (60449) <20180315071706.4F5F112505A@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.089 seconds Mar 15 09:18:20 2018 (60449) <20180315071711.BDFE412505A@naf.iem.gov.lv> smtp to dml-patch for 27 recips, completed in 0.112 seconds Mar 15 09:23:06 2018 (60449) <20180315072058.5882812506A@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.129 seconds Mar 15 09:23:34 2018 (60449) <20180315072217.AE70D125068@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.560 seconds Mar 15 09:23:41 2018 (60449) <20180315072244.39896124733@naf.iem.gov.lv> smtp to dml-patch for 28 recips, completed in 0.061 seconds list_members command always shows correct members count 28. /usr/lib/mailman/bin/list_members dml-patch | wc -l 28 OS CentOS Linux release 7.4.1708 Using Mailman version: 2.1.15 (standart centos package) The same problem was occur on Red Hat Enterprise Linux Server release 6.9 (Santiago) Mailman version: 2.1.12 ** Affects: mailman Importance: Undecided Status: New -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/1756009 Title: emails are not delivered to all recipients To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/1756009/+subscriptions